IPv6 Static Routing

49 questions

Question 21Question

A network engineer needs to manually configure a backup route on Router R1 toward the remote prefix 2001:db8:cafe:40::/642001:\text{db8}:\text{cafe}:40::/64. The primary route to this subnet is learned via OSPFv3 with an administrative distance of 110. The engineer must use the neighboring router's link-local address fe80::250:56ff:fe9a:12ab\text{fe80}::250:56ff:\text{fe9a}:12ab reachable through interface GigabitEthernet0/0/1. What complete Cisco IOS global configuration command must be entered to establish this route as a floating static route with an administrative distance of 130?

Fill in the blanks below

R1(config)#
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Answer

The complete command required is 'ipv6 route 2001:db8:cafe:40::/64 GigabitEthernet0/0/1 fe80::250:56ff:fe9a:12ab 130'.
To route IPv6 traffic using a link-local address (FE80::/10) as the next hop, Cisco IOS requires a fully specified static route syntax that defines the local exit interface followed by the link-local address. Without specifying the exit interface, the router cannot determine which local physical or logical link reaches that link-local address. Additionally, appending the administrative distance value 130 ensures the static route remains inactive in the routing table until the primary OSPFv3 route (AD 110) fails.

Step-by-Step Solution

1
Identify the base global configuration command for IPv6 static routing.
The command structure starts with 'ipv6 route'.
Cisco IOS requires 'ipv6 route' in global configuration mode to declare static routes for IPv6.
2
Append the destination IPv6 prefix and prefix-length.
Add '2001:db8:cafe:40::/64' after the command keyword.
Static routing requires specifying the exact destination prefix using CIDR slash notation.
3
Identify the mandatory parameters when utilizing a link-local address as the next hop.
Specify the local exit interface 'GigabitEthernet0/0/1' immediately followed by the link-local address 'fe80::250:56ff:fe9a:12ab'.
Because link-local addresses (FE80::/10) are only unique on a per-link basis, Cisco IOS requires a fully specified static route containing both the outbound interface and the next-hop link-local IP.
4
Set the administrative distance for floating route behavior.
Append '130' at the end of the command.
A primary OSPFv3 route has an administrative distance of 110. To function as a backup floating static route, the static route's administrative distance must be higher than 110.

Key Concept

Fully Specified IPv6 Floating Static Route Configuration
Question 22Question

A network technician is configuring an IPv6 static route on a Cisco router. The destination network is 2001:db8:c0ff:50::/642001:\text{db8}:\text{c0ff}:50::/64. The next-hop router's link-local IPv6 address is fe80::a5\text{fe80}::a5, and traffic must exit via the local interface GigabitEthernet0/0/0. What is the exact, complete Cisco IOS command required to configure this fully specified static route with a custom administrative distance of 130?

Fill in the blanks below

Enter the complete Cisco IOS command:
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Answer

ipv6 route 2001:db8:c0ff:50::/64 GigabitEthernet0/0/0 fe80::a5 130
Configuring an IPv6 static route with a link-local next-hop address requires a fully specified route format: 'ipv6 route <destination-prefix/prefix-length> <exit-interface> <link-local-next-hop> [administrative-distance]'. In this scenario, combining the target prefix '2001:db8:c0ff:50::/64', local exit interface 'GigabitEthernet0/0/0', link-local next-hop 'fe80::a5', and administrative distance '130' results in 'ipv6 route 2001:db8:c0ff:50::/64 GigabitEthernet0/0/0 fe80::a5 130'.

Step-by-Step Solution

1
Identify the base global configuration command and destination prefix.
The static route command begins with 'ipv6 route' followed by the target IPv6 network prefix and prefix length '2001:db8:c0ff:50::/64'.
Cisco IOS requires the keyword 'ipv6 route' followed immediately by the destination network identifier.
2
Identify the requirement for specifying the local exit interface.
Place 'GigabitEthernet0/0/0' after the destination prefix.
Because link-local addresses (fe80::/10) are scope-local and ambiguous across multiple router interfaces, Cisco IOS requires specifying the exit interface whenever a link-local address is used as a next hop.
3
Append the link-local next-hop address and administrative distance.
Add the link-local next-hop IPv6 address 'fe80::a5' followed by the administrative distance integer '130'.
Completes the syntax for a fully specified IPv6 static route while applying the requested custom administrative distance.

Key Concept

Fully Specified IPv6 Static Route Configuration
Estimated Time:1m 30s
Question 23Question

A network administrator needs to configure an IPv6 default static route on a Cisco IOS router pointing to the exit interface GigabitEthernet0/0. Complete the command by specifying the IPv6 default route prefix notation.

Fill in the blanks below

ipv6 route GigabitEthernet0/0
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Answer

The correct prefix notation to complete the IPv6 static default route command is ::/0.
The IPv6 default route prefix is designated as ::/0, which matches all destination networks regardless of prefix length.

Step-by-Step Solution

1
Identify the IPv6 address representation for a default route.
In IPv6 addressing, all zeros with a prefix length of zero bits is represented using compressed format as ::/0.
The prefix ::/0 matches any IPv6 destination network when no more specific match exists in the routing table.

Key Concept

IPv6 Default Static Route Syntax
Question 24Question

A network administrator is configuring a floating static route on router R1 to reach the destination prefix 2001:db8:acad:10::/642001:\text{db8}:\text{acad}:10::/64. The primary path to this network is currently learned via OSPFv3 with an Administrative Distance of 110. The administrator wants to configure the backup static route using the next-hop neighbor's link-local IPv6 address fe80::2fe80::2 across R1's local interface GigabitEthernet0/1. Which command must be entered on R1 to correctly configure this floating static route?

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Answer: ipv6 route 2001:db8:acad:10::/64 GigabitEthernet0/1 fe80::2 120

Answer

The command 'ipv6 route 2001:db8:acad:10::/64 GigabitEthernet0/1 fe80::2 120' is the correct configuration.
The option specifying 'ipv6 route 2001:db8:acad:10::/64 GigabitEthernet0/1 fe80::2 120' uses the valid Cisco IOS syntax for a fully specified static route using a link-local next hop. The local exit interface GigabitEthernet0/1 resolves link-local address ambiguity, and an Administrative Distance of 120 ensures the route functions correctly as a floating static backup to the active OSPFv3 route (AD 110).

Step-by-Step Solution

1
Identify the mandatory components of an IPv6 static route using a link-local address.
Because IPv6 link-local addresses (fe80::/10) are non-routable outside their local link, Cisco IOS requires both the local exit interface and the link-local next-hop address (fully specified static route).
Without specifying the exit interface, the router cannot determine which local segment contains the target fe80::2 address.
2
Determine the required Administrative Distance for a floating static route.
The primary route is OSPFv3 with AD = 110. The floating static route AD must be greater than 110 (e.g., 120).
Setting an AD higher than the primary routing protocol ensures the static route remains inactive in the routing table until the primary OSPFv3 route fails.
3
Verify Cisco IOS syntax order.
The syntax structure is 'ipv6 route <prefix/length> <exit-interface> <link-local-address> [administrative-distance]'.
The correct command syntax specifies interface GigabitEthernet0/1 followed by next-hop fe80::2 and AD 120.

Key Concept

Fully Specified IPv6 Static Route and Floating Static Route AD Configuration
Question 25Question

A network technician is configuring an IPv6 static route on a router to reach network 2001:DB8:5000:10::/642001:\text{DB8}:\text{5000}:10::/64. The technician intends to use the neighbor's link-local address FE80::2\text{FE80}::2 as the next hop. Which Cisco IOS command correctly configures this route using local interface GigabitEthernet0/1?

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Answer: ipv6 route 2001:DB8:5000:10::/64 GigabitEthernet0/1 FE80::2

Answer

The command 'ipv6 route 2001:DB8:5000:10::/64 GigabitEthernet0/1 FE80::2' correctly configures the static route.
In Cisco IOS, a fully specified static route using a link-local next-hop address MUST explicitly specify the local exit interface (e.g., GigabitEthernet0/1) prior to the link-local address. This resolves ambiguity because link-local addresses exist on every IPv6-enabled interface.

Step-by-Step Solution

1
Identify the proper command syntax for IPv6 static routing
Begin with 'ipv6 route' followed by the target destination prefix and length.
Cisco IOS requires 'ipv6 route' for configuring static IPv6 prefixes.
2
Determine interface and next-hop parameter rules for link-local addresses
Include the local exit interface GigabitEthernet0/1 before the next-hop link-local address FE80::2\text{FE80}::2.
Because link-local addresses belong to the FE80::/10\text{FE80}::/10 block and are non-routable outside their local segment, the router must know which exit interface to use to reach the next hop.

Key Concept

IPv6 Static Route Link-Local Next-Hop Syntax
Question 26Question

An engineer is configuring a static route on a Cisco router to reach the destination subnet 2001:db8:a100:12::/642001:\text{db8}:\text{a100}:12::/64 using the neighbor link-local address fe80::fe22:1\text{fe80}::\text{fe22}:1 via local interface GigabitEthernet0/1\text{GigabitEthernet0/1}. Complete the Cisco IOS configuration command by filling in the missing parameters in order.

Fill in the blanks below

ipv6 route 2001:db8:a100:12::/64
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Answer

The complete command is: ipv6 route 2001:db8:a100:12::/64 GigabitEthernet0/1 fe80::fe22:1
In Cisco IOS IPv6 static routing, when a link-local address is designated as the next hop, the command must explicitly include the local exit interface preceding the link-local address. Therefore, the first parameter must specify the interface (GigabitEthernet0/1) and the second parameter must specify the link-local address (fe80::fe22:1).

Step-by-Step Solution

1
Identify the standard Cisco IOS IPv6 static route command structure for link-local next hops.
The command syntax is: ipv6 route <destination-prefix/prefix-length> <exit-interface> <link-local-next-hop>.
Cisco IOS requires specifying the local exit interface when using an IPv6 link-local address as a next hop because link-local addresses are unique only within the scope of a single link.
2
Fill in the required exit interface parameter for the first blank.
blank_1 is GigabitEthernet0/1 (or acceptable interface abbreviation such as gi0/1 or g0/1).
The exit interface specifies which local link to use to resolve the link-local address.
3
Fill in the next-hop IPv6 link-local address for the second blank.
blank_2 is fe80::fe22:1.
The next-hop link-local address follows the exit interface parameter in a fully specified IPv6 static route.

Key Concept

IPv6 Fully Specified Static Route
Estimated Time:1m 15s
Question 27Question

An engineer is configuring a secondary backup route on core router R1 to reach remote subnet 2001:db8:89ab:2000::/562001:\text{db8}:89\text{ab}:2000::/56 through neighboring router R2. The primary route is learned dynamically via OSPFv3 with an Administrative Distance of 110110. The interconnecting segment between R1 and R2 uses GigabitEthernet0/0/1. R2's interface on this link uses the link-local address fe80::211:22ff:fe33:4455\text{fe80}::211:22\text{ff}:\text{fe33}:4455. Which Cisco IOS command must be configured on R1 to create a valid floating static route with an Administrative Distance of 130130 using R2's link-local address?

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Answer: ipv6 route 2001:db8:89ab:2000::/56 GigabitEthernet0/0/1 fe80::211:22ff:fe33:4455 130

Answer

The command 'ipv6 route 2001:db8:89ab:2000::/56 GigabitEthernet0/0/1 fe80::211:22ff:fe33:4455 130' correctly specifies both the exit interface and link-local next-hop address with an Administrative Distance of 130.
When configuring an IPv6 static route using a link-local next-hop address (fe80::/10\text{fe80}::/10), Cisco IOS strictly mandates a fully specified route. This format includes the local exit interface followed by the link-local address of the adjacent router. Appending the value 130 at the end of the syntax correctly sets the Administrative Distance higher than OSPFv3 (110), successfully forming a floating static route.

Step-by-Step Solution

1
Identify the mandatory components of an IPv6 static route using a link-local address as the next hop.
Because link-local addresses (fe80::/10\text{fe80}::/10) are shared across multiple local links, Cisco IOS requires a fully specified route syntax: 'ipv6 route <prefix/mask> <exit-interface> <link-local-next-hop> [AD]'.
Without the local exit interface, the router cannot determine which physical or logical link to use to reach the target link-local address.
2
Verify Administrative Distance manipulation for floating static route capability.
The primary path is learned via OSPFv3 with AD = 110110. Setting the static route AD to 130130 ensures it remains inactive in the IPv6 routing table until the primary OSPFv3 route disappears.
Floating static routes require an Administrative Distance higher than the active primary routing protocol.
3
Validate the exact command string structure.
The target prefix is 2001:db8:89ab:2000::/562001:\text{db8}:89\text{ab}:2000::/56, the local exit interface is GigabitEthernet0/0/1, the next-hop link-local address is fe80::211:22ff:fe33:4455\text{fe80}::211:22\text{ff}:\text{fe33}:4455, and the metric parameter is 130.
This matches the exact fully specified static route configuration requirements in Cisco IOS.

Key Concept

Fully Specified IPv6 Static Routes and Link-Local Next-Hop Requirements
Question 28Question

A network engineer is configuring static routes on a Cisco IOS router to establish connectivity across an enterprise IPv6 infrastructure. Which two statements correctly describe valid IPv6 static route configuration syntax and operational requirements on Cisco IOS?

Select all that apply

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Answer: When specifying a link-local IPv6 address as the next-hop, the local exit interface must also be explicitly specified in the static route command.; A floating static IPv6 route is configured by manually assigning an administrative distance that is higher than the administrative distance of the primary route.

Answer

The two correct statements are: specifying a link-local next-hop address requires defining the local exit interface in the command, and configuring a floating static IPv6 route requires setting an administrative distance higher than that of the primary route.
The statement specifying that a link-local next-hop requires the local exit interface is correct because link-local addresses are non-unique across different interface links. The statement describing floating static routes is correct because setting an administrative distance higher than the active dynamic protocol or primary static route keeps the backup route inactive until the primary route fails.

Step-by-Step Solution

1
Analyze link-local address scoping rules in Cisco IOS static routing.
Link-local addresses (FE80::/10) are link-dependent and non-routable beyond their local segment. Consequently, Cisco IOS requires specifying the egress interface when using a link-local next-hop address.
Without specifying the egress interface, the router cannot determine which local link segment to transmit packets to reach the FE80:: next-hop.
2
Evaluate the administrative distance mechanism for floating static routes.
A floating static route uses a artificially high administrative distance (e.g., AD of 130 backing up OSPF with AD of 110).
The router installs the route into the IPv6 RIB only if lower AD routes for the destination prefix become unavailable.
3
Verify EUI-64 generation rules and global unicast next-hop syntax options.
EUI-64 requires both FFFE insertion and flipping the 7th bit. Global unicast next-hop static routes can be configured recursively without defining an egress interface.
Global unicast addresses are globally unique and can be resolved recursively via the routing table.

Key Concept

IPv6 Static Routing Syntax and Next-Hop Resolution
Question 29Question

A network administrator is configuring static routing on router R1 to forward traffic toward network 2001:db8:3c4d:10::/64. The administrator intends to use the link-local address fe80::211:22ff:fe33:4455 of the neighboring router connected to local interface GigabitEthernet0/1. Which Cisco IOS command correctly configures this static route?

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Answer: ipv6 route 2001:db8:3c4d:10::/64 GigabitEthernet0/1 fe80::211:22ff:fe33:4455

Answer

The command 'ipv6 route 2001:db8:3c4d:10::/64 GigabitEthernet0/1 fe80::211:22ff:fe33:4455' correctly configures the fully specified IPv6 static route.
The statement specifying the local exit interface GigabitEthernet0/1 followed by the next-hop link-local address fe80::211:22ff:fe33:4455 complies exactly with Cisco IOS requirements for fully specified IPv6 static routes.

Step-by-Step Solution

1
Identify the proper Cisco IOS command prefix for IPv6 routing
The command must start with 'ipv6 route' rather than 'ip route'.
Cisco IOS separates IPv4 and IPv6 static route configurations into distinct global commands.
2
Evaluate the next-hop address scope
The next-hop address 'fe80::211:22ff:fe33:4455' is a link-local IPv6 address (fe80::/10).
Link-local addresses exist on every IPv6-enabled interface, so an egress interface MUST be supplied to resolve ambiguity.
3
Verify Cisco IOS syntax parameter ordering
The syntax requires 'ipv6 route <prefix/length> <exit-interface> <link-local-address>'.
Specifying GigabitEthernet0/1 followed by fe80::211:22ff:fe33:4455 forms a valid fully specified static route.

Key Concept

Fully Specified IPv6 Static Routes with Link-Local Next-Hops
Question 30Question

A network administrator is configuring a backup route on a Cisco IOS router to reach a remote branch office network with the prefix 2001:db8:fedc:9900::/562001:\text{db8}:\text{fedc}:9900::/56. The primary path is currently provided by OSPFv3 with an administrative distance of 110110. The administrator must configure a floating static route using the next-hop router's link-local address fe80::cafe:1fe80::cafe:1 over the local exit interface GigabitEthernet0/0/1GigabitEthernet0/0/1. Which command correctly configures this backup floating static route on the router?

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Answer: ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::cafe:1 120

Answer

The command 'ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::cafe:1 120' correctly configures the backup floating static route.
The correct command syntax for an IPv6 static route using a link-local next-hop requires specifying both the local exit interface and the link-local address of the neighbor. Furthermore, setting the administrative distance to 120120 ensures it is higher than the primary OSPFv3 route's administrative distance of 110110, making it a true floating static route.

Step-by-Step Solution

1
Determine the required administrative distance for the backup route.
Since OSPFv3 has an administrative distance of 110110, the backup route must have an administrative distance greater than 110110 (such as 120120) to remain floating (inactive until the primary route fails).
Floating static routes rely on a higher administrative distance than the primary routing protocol.
2
Identify the next-hop address requirements for IPv6 static routing.
When using a link-local IPv6 address (fe80::/10fe80::/10) as the next-hop, Cisco IOS mandates a fully specified static route that includes the local exit interface (GigabitEthernet0/0/1GigabitEthernet0/0/1).
Link-local addresses are non-routable and only unique to the specific local link/interface.
3
Construct the exact Cisco IOS syntax.
'ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::cafe:1 120'
Syntax follows 'ipv6 route <prefix/mask> <exit-interface> <next-hop-address> [administrative-distance]'.

Key Concept

Fully Specified IPv6 Floating Static Route Configuration
Question 31Question

A network administrator is configuring static routing on router HQ to forward traffic bound for remote subnet 2001:db8:feed:10::/642001:\text{db8}:\text{feed}:10::/64. The outbound connection uses a point-to-point serial-like Ethernet link where the remote router interface uses the link-local address fe80::21a:2bff:fe3c:4d5e\text{fe80}::21a:2bff:\text{fe3c}:4d5e on interface GigabitEthernet0/0/1. The primary path must use an administrative distance of 11, but if configured using a link-local next-hop address without an outbound interface specified, Cisco IOS will reject the command. Which command correctly establishes a fully-specified IPv6 static route for this destination using the link-local next hop?

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Answer: ipv6 route 2001:db8:feed:10::/64 GigabitEthernet0/0/1 fe80::21a:2bff:fe3c:4d5e

Answer

The correct command is 'ipv6 route 2001:db8:feed:10::/64 GigabitEthernet0/0/1 fe80::21a:2bff:fe3c:4d5e', which specifies both the exit interface and the link-local address for a fully-specified IPv6 static route.
When configuring an IPv6 static route with a link-local address as the next hop, Cisco IOS requires a fully-specified static route syntax: 'ipv6 route <destination-prefix/prefix-length> <exit-interface> <link-local-next-hop>'. Since link-local addresses (FE80::/10) are only unique on the local link, specifying GigabitEthernet0/0/1 clarifies which link to transmit packets across.

Step-by-Step Solution

1
Identify the destination prefix and prefix length.
The target prefix is 2001:db8:feed:10::/642001:\text{db8}:\text{feed}:10::/64.
The prefix must be explicitly identified at the start of the Cisco IOS IPv6 static route command syntax.
2
Determine the next-hop mechanism requirements for link-local addresses.
When a link-local address (fe80::\text{fe80}::\dots) is used as a next hop, Cisco IOS requires specifying the local exit interface alongside the link-local address.
Link-local addresses are scope-limited to a single link, so the router needs the exit interface identifier to know which link to send the packet on.
3
Construct the exact syntax for a fully-specified route.
The syntax is 'ipv6 route <prefix/length> <exit-interface> <link-local-address>'.
This syntax creates a valid fully-specified IPv6 static route with the default administrative distance of 1.

Key Concept

IPv6 Fully-Specified Static Routing with Link-Local Next-Hop
Question 32Question

A network administrator is configuring IPv6 static routing on router R1 to reach the destination network 2001:db8:acad:10::/642001:\text{db8}:\text{acad}:10::/64. Router R1 connects to neighboring router R2 via interface GigabitEthernet0/0/1. Router R2's connected interface has a global unicast address of 2001:db8:acad:12::2/642001:\text{db8}:\text{acad}:12::2/64 and a link-local address of fe80::2\text{fe80}::2.

Which two Cisco IOS commands represent valid IPv6 static route configurations on R1? (Select two.)

Select all that apply

Show answer & explanation

Answer: ipv6 route 2001:db8:acad:10::/64 GigabitEthernet0/0/1 fe80::2; ipv6 route 2001:db8:acad:10::/64 2001:db8:acad:12::2

Answer

The valid IPv6 static route configurations are 'ipv6 route 2001:db8:acad:10::/64 GigabitEthernet0/0/1 fe80::2' and 'ipv6 route 2001:db8:acad:10::/64 2001:db8:acad:12::2'.
In Cisco IOS, IPv6 static routes using a link-local address as the next hop require a fully specified syntax that includes the local exit interface. Alternatively, static routes using a global unicast address as the next hop require only the destination prefix and the next-hop IPv6 address.

Step-by-Step Solution

1
Evaluate link-local next-hop static route requirements in Cisco IOS.
Link-local addresses (fe80::/10\text{fe80}::/10) are scoped only to a single link. Therefore, Cisco IOS requires specifying the local exit interface alongside the link-local next-hop address.
Without specifying the exit interface, the router cannot determine which physical link to forward the packet out of.
2
Evaluate global unicast next-hop static route requirements in Cisco IOS.
Global unicast addresses are globally unique, allowing the router to perform a recursive routing table lookup to find the egress interface.
Specifying only the global unicast next-hop address creates a valid recursive static route.

Key Concept

IPv6 Static Route Next-Hop Syntax Rules
Question 33Question

An engineer is configuring a backup fully-specified IPv6 static route on router R1 toward the remote destination network 2001:db8:500:10::/642001:\text{db8}:500:10::/64. The primary path is learned via OSPFv3. The backup route must forward traffic to the next-hop router's link-local address fe80::2\text{fe80::2} via local interface GigabitEthernet0/1 with an administrative distance of 130. Complete the required Cisco IOS configuration command.

Fill in the blanks below

ipv6 route 2001:db8:500:10::/64 130
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Answer

The complete command is 'ipv6 route 2001:db8:500:10::/64 GigabitEthernet0/1 fe80::2 130'.
When configuring an IPv6 static route using a link-local next-hop address, Cisco IOS requires a fully specified static route format: `ipv6 route <prefix/length> <exit-interface> <link-local-address> [administrative-distance]`. Thus, GigabitEthernet0/1 must be specified as the exit interface in the first blank, and fe80::2 as the next hop in the second blank.

Step-by-Step Solution

1
Identify the target IPv6 network prefix and length.
The destination prefix is 2001:db8:500:10::/64.
IPv6 static routes require the destination network prefix with prefix length.
2
Determine the required syntax for using a link-local address as a next hop.
When a link-local address (fe80::2) is specified as the next hop, Cisco IOS requires the local exit interface (GigabitEthernet0/1) to precede the link-local address in the command.
Link-local addresses are only unique to the local link, so the router must know which egress interface to send the traffic out of.
3
Append the administrative distance parameter.
An administrative distance of 130 is placed at the end of the command.
The primary OSPFv3 route has an administrative distance of 110; setting the static route to 130 creates a floating static route.

Key Concept

IPv6 Fully Specified Static Route and Floating Static Route Syntax
Question 34Question

A network administrator is configuring a backup floating static IPv6 route on router R1 to reach the remote prefix 2001:db8:acad:44::/642001:\text{db8}:\text{acad}:44::/64. The primary route to this subnet is learned via OSPFv3 with an administrative distance of 110. The administrator wants to route backup traffic through the link-local address fe80::211:23ff:fe45:6789fe80::211:23ff:fe45:6789 of the neighboring router connected to interface GigabitEthernet0/0/1GigabitEthernet0/0/1, assigning an administrative distance of 130. Which Cisco IOS command correctly configures this floating static route?

Show answer & explanation

Answer: ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:fe45:6789 130

Answer

The command 'ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:fe45:6789 130' correctly configures the fully specified floating static IPv6 route.
The correct command uses the syntax 'ipv6 route <prefix/mask> <exit-interface> <next-hop-address> [administrative-distance]'. When a link-local address is used as the next hop, the local exit interface is mandatory because link-local addresses are scoped to the local link. Specifying an administrative distance of 130 ensures the route functions as a floating static route, acting as a backup to the OSPFv3 route which has an administrative distance of 110.

Step-by-Step Solution

1
Identify the requirements for using a link-local address as an IPv6 static route next hop.
Because IPv6 link-local addresses (FE80::/10) are non-routable and exist only on a single local link, Cisco IOS requires specifying the local exit interface alongside the link-local next-hop address (a fully specified static route).
Without the exit interface, the router cannot resolve which interface to forward packets out of toward the non-unique link-local address.
2
Determine the administrative distance required for a floating static backup route.
The primary route has an OSPFv3 administrative distance of 110. To create a backup route that remains dormant in the routing table until the primary route fails, the static route AD must be set higher than 110 (specifically 130 as requested).
Lower administrative distances are preferred by the Cisco IOS routing table logic.
3
Verify syntax and address accuracy.
The syntax 'ipv6 route <prefix/mask> <exit-interface> <link-local-next-hop> <administrative-distance>' yields 'ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:fe45:6789 130'.
This matches all parameters, including proper EUI-64 link-local address formatting and correct AD placement.

Key Concept

Fully specified IPv6 static routes using link-local next-hop addresses and floating static administrative distance configuration.
Question 35Question

A network administrator needs to manually configure an IPv6 static route on router R2 to forward traffic toward subnet 2001:db8:cafe:20::/642001:\text{db8}:cafe:20::/64. The next-hop router R1 uses a link-local IPv6 address of fe80::1\text{fe80}::1 on the shared point-to-point link attached to R2's local interface GigabitEthernet0/1. Which Cisco IOS command correctly configures this route?

Show answer & explanation

Answer: ipv6 route 2001:db8:cafe:20::/64 GigabitEthernet0/1 fe80::1

Answer

The command 'ipv6 route 2001:db8:cafe:20::/64 GigabitEthernet0/1 fe80::1' correctly configures the fully specified IPv6 static route.
In IPv6 static routing, when a link-local address (fe80::/10 range) is referenced as the next-hop address, the router requires a fully specified route. The syntax must explicitly state the local outbound interface followed by the link-local IPv6 address.

Step-by-Step Solution

1
Identify the target IPv6 prefix, exit interface, and next-hop address type.
Destination is 2001:db8:cafe:20::/642001:\text{db8}:cafe:20::/64, local exit interface is GigabitEthernet0/1, and next-hop is link-local address fe80::1\text{fe80}::1.
IPv6 link-local addresses are non-routable beyond the local link and can exist on multiple interface links on the same router.
2
Apply Cisco IOS IPv6 fully specified static route syntax rules.
The correct command format is 'ipv6 route <ipv6-prefix/prefix-length> <exit-interface> <link-local-next-hop>'.
Without the local exit interface parameter specified first, the router cannot resolve which link the link-local neighbor resides on.

Key Concept

IPv6 Fully Specified Static Routing with Link-Local Next-Hop
Estimated Time:1m 30s
Question 36Question

A network administrator needs to configure a backup floating static default route on router Edge-R1 to reach an upstream provider. The primary default route is currently learned via OSPFv3 with an administrative distance of 110110. The next-hop provider router interface has a global unicast address of 2001:db8:200:1::1/642001:\text{db8}:200:1::1/64 and a link-local address of fe80::250:56ff:fe9a:1234\text{fe80}::250:56\text{ff}:\text{fe9a}:1234 connected directly to interface GigabitEthernet0/0/0 on Edge-R1. Which command correctly configures the floating static default route using the provider's link-local address with an administrative distance of 130130?

Show answer & explanation

Answer: ipv6 route ::/0 GigabitEthernet0/0/0 fe80::250:56ff:fe9a:1234 130

Answer

The correct command is 'ipv6 route ::/0 GigabitEthernet0/0/0 fe80::250:56ff:fe9a:1234 130'.
The option specifying 'ipv6 route ::/0 GigabitEthernet0/0/0 fe80::250:56ff:fe9a:1234 130' is correct because '::/0' represents the default route, the exit interface GigabitEthernet0/0/0 is explicitly declared alongside the link-local next hop, and the administrative distance of 130 makes it a floating static backup route relative to OSPFv3 (110).

Step-by-Step Solution

1
Identify the IPv6 network prefix representation for a default route.
The default route in IPv6 is represented by the prefix '::/0'.
Default routes match all destination IPv6 addresses not specifically listed in the routing table.
2
Determine the syntax requirements for specifying a link-local address as a next-hop.
When a link-local address (fe80::/10) is specified as the next hop, the local exit interface (GigabitEthernet0/0/0) must precede the next-hop address.
Link-local addresses are only unique on the local link, requiring explicit egress interface designation.
3
Set the administrative distance for floating static route functionality.
Set the administrative distance to 130, which is higher than OSPFv3's administrative distance of 110.
A floating static route remains inactive in the routing table until the primary dynamic routing path fails.

Key Concept

IPv6 Static Route Syntax with Link-Local Next-Hop and Floating Administrative Distance
Question 37Question

A network engineer must configure path redundancy on a Cisco IOS router for reaching the remote IPv6 prefix 2001:db8:4000:50::/642001:\text{db8}:4000:50::/64. The primary path must forward packets through interface GigabitEthernet0/0/1 using the next-hop router's link-local IPv6 address fe80::2\text{fe80}::2. The secondary backup path must forward packets toward the global unicast next-hop IPv6 address 2001:db8:1000:20::22001:\text{db8}:1000:20::2 only if the primary path fails. Which TWO Cisco IOS commands are required to satisfy these requirements?

Select all that apply

Show answer & explanation

Answer: ipv6 route 2001:db8:4000:50::/64 GigabitEthernet0/0/1 fe80::2; ipv6 route 2001:db8:4000:50::/64 2001:db8:1000:20::2 130

Answer

The correct configuration requires both the command specifying the local exit interface alongside the link-local next-hop address ('ipv6 route 2001:db8:4000:50::/64 GigabitEthernet0/0/1 fe80::2') and the command defining a higher administrative distance for the backup route ('ipv6 route 2001:db8:4000:50::/64 2001:db8:1000:20::2 130').
The combination of using a fully-specified route syntax for link-local next-hops ('GigabitEthernet0/0/1 fe80::2') and appending an elevated Administrative Distance of 130 for the global unicast backup path ensures that link-local scoping syntax rules are respected and that the backup route remains floating until primary path failure.

Step-by-Step Solution

1
Analyze link-local IPv6 static routing requirements.
Link-local addresses (fe80::/10) are only unique per link. Cisco IOS cannot determine which interface to send traffic through if only a link-local next-hop address is provided. Therefore, the exit interface MUST be specified when using a link-local next-hop.
Ensures proper outgoing interface binding for link-scoped IPv6 destinations.
2
Analyze floating static route AD requirements.
To configure a floating static route as a secondary backup path, an Administrative Distance (AD) higher than default static routes (AD 1) must be explicitly appended to the command (e.g., AD 130).
Prevents the secondary route from populating the IPv6 routing table while the primary route is active.

Key Concept

IPv6 Static Route Syntax & Floating Static Administrative Distance
Question 38Question

A network administrator needs to configure an IPv6 static route on router R1 to forward traffic to the remote network 2001:db8:10:20::/642001:\text{db8}:10:20::/64. The next-hop router's interface has a link-local address of fe80::212:79ff:fe34:5678\text{fe80}::212:79\text{ff}:\text{fe34}:5678 connected to R1's local interface GigabitEthernet0/0/1. Which Cisco IOS command correctly provisions this static route?

Show answer & explanation

Answer: ipv6 route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::212:79ff:fe34:5678

Answer

The command 'ipv6 route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::212:79ff:fe34:5678' correctly configures the fully specified IPv6 static route.
The command correctly uses the Cisco IOS syntax for a static route pointing to a link-local address: 'ipv6 route <prefix/length> <exit-interface> <link-local-address>'. Because link-local IPv6 addresses (FE80::/10) are valid only on the local link, the local exit interface must be explicitly stated.

Step-by-Step Solution

1
Identify the target destination prefix and length.
Destination prefix is 2001:db8:10:20::/642001:\text{db8}:10:20::/64.
The prefix specifies the remote network to be added to the IPv6 routing table.
2
Evaluate the next-hop address type.
The next-hop address fe80::212:79ff:fe34:5678\text{fe80}::212:79\text{ff}:\text{fe34}:5678 is a link-local IPv6 address (starts with FE80::/10).
Link-local addresses require explicit egress interface identification because they are bound to a specific link.
3
Apply Cisco IOS IPv6 static route command syntax for link-local next hops.
Syntax must be: 'ipv6 route <prefix/length> <exit-interface> <link-local-next-hop>'.
Cisco IOS requires the local exit interface (GigabitEthernet0/0/1) immediately following the prefix and preceding the link-local address.

Key Concept

IPv6 Static Routing with Link-Local Next Hop
Question 39Question

A network administrator is configuring static routing on Cisco router Branch-R1 to reach remote subnet 2001:db8:3c4d:15::/642001:\text{db8}:3\text{c4d}:15::/64. The routing design requires a primary path using next-hop global unicast address 2001:db8:3c4d:12::22001:\text{db8}:3\text{c4d}:12::2, and a floating static backup path using link-local next-hop address fe80::2\text{fe80}::2 reachable via interface GigabitEthernet0/0/1. Which two commands must be configured on Branch-R1 to fulfill these requirements? (Select two.)

Select all that apply

Show answer & explanation

Answer: ipv6 route 2001:db8:3c4d:15::/64 2001:db8:3c4d:12::2; ipv6 route 2001:db8:3c4d:15::/64 GigabitEthernet0/0/1 fe80::2 130

Answer

The correct commands are 'ipv6 route 2001:db8:3c4d:15::/64 2001:db8:3c4d:12::2' for the primary route and 'ipv6 route 2001:db8:3c4d:15::/64 GigabitEthernet0/0/1 fe80::2 130' for the floating static backup route.
For the primary path, specifying the destination IPv6 prefix and the global unicast next-hop address provides sufficient forwarding information to the routing table. For the backup path, using a link-local IPv6 address requires a fully specified route format that explicitly includes the exit interface (GigabitEthernet0/0/1), combined with an administrative distance greater than 1 (such as 130) so that it functions as a floating backup route.

Step-by-Step Solution

1
Identify the proper syntax for a primary IPv6 static route using a global unicast next-hop address.
The command syntax is 'ipv6 route <destination-prefix/prefix-length> <global-unicast-next-hop>'. This maps to 'ipv6 route 2001:db8:3c4d:15::/64 2001:db8:3c4d:12::2'.
Global unicast addresses are uniquely identifiable across interfaces, so specifying an exit interface is optional.
2
Identify the mandatory components when configuring a fully specified IPv6 static route with a link-local next-hop address.
Because link-local addresses (fe80::/10) are reused across multiple physical links, Cisco IOS demands both the local exit interface and the link-local address.
Without the local exit interface, the router cannot determine which physical link to transmit packets on to reach fe80::2.
3
Determine the administrative distance requirement for a floating static route.
Assign an administrative distance higher than the primary route's default AD of 1 (e.g., 130).
A higher administrative distance ensures the route remains inactive in the IPv6 routing table until the primary route fails.

Key Concept

IPv6 Static Route Syntax and Link-Local Next-Hop Requirements
Question 40Question

A network administrator needs to configure a secondary floating default route on router Edge-2 toward an upstream ISP. The primary default route is learned dynamically via OSPFv3 with a administrative distance of 110. The backup route must forward all unmatched traffic out local interface GigabitEthernet0/1 to the ISP router's link-local next-hop address fe80::250:56ff:fea1:2b3c using an administrative distance of 130. Complete the global configuration command required on router Edge-2 to create this fully specified floating default static route.

Fill in the blanks below

ipv6 route GigabitEthernet0/1 fe80::250:56ff:fea1:2b3c
Show answer & explanation

Answer

The first blank requires '::/0' to designate the default IPv6 prefix, and the second blank requires '130' to set the administrative distance for the floating static route.
An IPv6 default static route uses the prefix '::/0'. When using a link-local address (fe80::/10) as a next-hop, Cisco IOS requires specifying the local exit interface alongside the link-local address because link-local addresses are scope-bound to a specific link. To make the static route a floating backup path behind OSPFv3 (AD 110), an administrative distance parameter of 130 is added to the end of the global configuration command syntax: 'ipv6 route <prefix/length> <exit-interface> <next-hop-address> [administrative-distance]'.

Step-by-Step Solution

1
Identify the destination prefix notation for an IPv6 default static route.
The default route covering all IPv6 destinations is represented by '::/0'.
In IPv6 prefix notation, ::/0 represents all possible IPv6 destinations, equivalent to 0.0.0.0 0.0.0.0 in IPv4.
2
Verify link-local next-hop syntax requirements.
The exit interface GigabitEthernet0/1 precedes the link-local address fe80::250:56ff:fea1:2b3c.
Link-local addresses (fe80::/10) are only unique on the local link segment. Cisco IOS mandates specifying the egress interface when using a link-local address as a next-hop.
3
Determine the administrative distance needed for floating route behavior.
Append '130' to the end of the command.
To float behind an active OSPFv3 route (AD 110), the static route's administrative distance must be higher than 110. The scenario specifies an AD of 130.

Key Concept

IPv6 Fully Specified Floating Static Default Route Syntax
Estimated Time:1m 30s
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