IP Connectivity

A Cisco router contains the following partial output in its IPv4 routing table:

text
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 4 subnets, 3 masks
O 10.88.0.0/16 [110/20] via 192.168.1.1, 00:14:22, GigabitEthernet0/0/0
D 10.88.12.0/22 [90/30720] via 192.168.2.1, 01:45:10, GigabitEthernet0/0/1
S 10.88.14.0/24 [1/0] via 192.168.3.1, 04:12:00, GigabitEthernet0/0/2
O 10.88.14.32/28 [110/65] via 192.168.4.1, 00:05:30, GigabitEthernet0/0/3

When the router receives a packet with the destination IP address 10.88.14.45, which next-hop IP address and outgoing interface will it use to forward the packet?

A network administrator must configure a static route on router R1 to reach the destination subnet $2001:\text{db8}:\text{acad}:10::/64$. The administrator intends to use the link-local address $\text{fe80}::2:1$ of the adjacent router as the next hop via R1's local exit interface GigabitEthernet0/0/1. Which Cisco IOS command accurately achieves this configuration?

A network engineer is troubleshooting an OSPFv2 neighbor relationship between two routers, R1 and R2, connected via a direct GigabitEthernet0/0 interface. R1's interface is configured with an MTU of 1500 bytes. When issuing the command `show ip ospf interface gigabitethernet0/0` on R2, the engineer observes the following truncated output:

GigabitEthernet0/0 is up, line protocol is up
Internet Address 10.0.12.2/24, Area 0
Process ID 1, Router ID 10.0.12.2, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
IP MTU bytes 1400

When running `show ip ospf neighbor` on R1, the neighbor status for R2 is listed as `EXSTART/ -`. Which statement correctly identifies the root cause of this stuck neighbor state and the appropriate command to bypass this requirement on R2?

During a scheduled maintenance window, a network specialist examines the OSPFv2 operational status of interface GigabitEthernet0/1 on router R3 using the Cisco IOS CLI:

text
GigabitEthernet0/1 is up, line protocol is up
Internet Address 10.1.1.3/24, Area 0
Process ID 1, Router ID 192.168.100.1, Network Type BROADCAST, Cost: 1
State DROTHER, Priority 0
Designated Router (ID) 10.1.1.1, Interface address 10.1.1.1
Backup Designated Router (ID) 10.1.1.2, Interface address 10.1.1.2

If both the current Designated Router (10.1.1.1) and Backup Designated Router (10.1.1.2) suffer a simultaneous power failure, which role will router R3 assume on this multiaccess segment after the network re-converges?

Refer to the following partial IPv4 routing table output from a Cisco router:

text
Codes: C - connected, S - static, D - EIGRP, O - OSPF

Gateway of last resort is 10.88.0.1 to network 0.0.0.0

S* 0.0.0.0/0 [1/0] via 10.88.0.1
O 10.88.0.0/16 [110/20] via 10.88.1.1, GigabitEthernet0/0/1
D 10.88.15.0/24 [90/307200] via 10.88.2.1, GigabitEthernet0/0/2
O 10.88.15.192/27 [110/50] via 10.88.3.1, GigabitEthernet0/0/3

The router receives a unicast IPv4 packet addressed to destination host 10.88.15.200. Which next-hop IP address will the router use to forward this packet?

An enterprise edge router R1 connects to two distinct Internet Service Providers via Ethernet interfaces. The network team requires primary outbound traffic to traverse ISP-1 via next-hop IPv4 address $203.0.113.1/30$ on interface GigabitEthernet0/0/1. A backup path must traverse ISP-2 via next-hop IPv4 address $198.51.100.1/30$ on interface GigabitEthernet0/0/2, taking effect only if the primary route fails.

Which two configuration statements or operational characteristics are correct for implementing this routing strategy?

A network administrator enables OSPFv2 on router R3 without manually configuring an OSPF router ID. The router has the following operational interfaces:

- Loopback0: $10.0.0.1/32$
- Loopback1: $172.16.1.1/32$
- GigabitEthernet0/0: $192.168.10.1/24$
- GigabitEthernet0/1: $192.168.20.1/24$

What IPv4 address will OSPFv2 select as the router ID for router R3?

A network administrator executes the command `ip route 10.50.1.0 255.255.255.0 172.16.1.2 120` on a Cisco IOS router. What does the numeric value `120` at the end of this command represent?

An administrator inspects the IPv4 routing table on a Cisco router and observes the following partial output:

text
Codes: C - connected, S - static, D - EIGRP, O - OSPF, B - BGP

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 4 subnets, 4 masks
O 10.200.0.0/16 [110/50] via 172.16.1.1, 00:24:12, GigabitEthernet0/1
D 10.200.64.0/18 [90/2172416] via 172.16.2.1, 02:15:04, GigabitEthernet0/2
S 10.200.64.0/24 [120/0] via 172.16.3.1, GigabitEthernet0/3
B 10.200.64.0/20 [20/100] via 172.16.4.1, 05:10:20, GigabitEthernet0/4

Which two statements accurately describe how the router will forward packets based on these routing table components? (Select two.)

Arrange the criteria used by OSPFv2 to determine Designated Router (DR) election precedence in order from highest precedence (evaluated first) to lowest precedence (evaluated last).

A network engineer changes the OSPFv2 network type on a GigabitEthernet interface linking two Cisco routers from the default Broadcast type to Point-to-Point using the interface subcommand `ip ospf network point-to-point`.

Which two operational changes occur on this interface as a direct result of this modification? (Choose two.)

An enterprise network engineer adds a new router, Core-GW3, to an existing OSPFv2 broadcast multiaccess Ethernet segment ($172.16.10.0/24$) where Router-A (Router ID $1.1.1.1$, Priority $100$) is currently acting as the Designated Router (DR) and Router-B (Router ID $2.2.2.2$, Priority $100$) is acting as the Backup Designated Router (BDR).

The engineer issues the following command on Core-GW3:

text
Core-GW3# show ip ospf interface GigabitEthernet0/0
GigabitEthernet0/0 is up, line protocol is up
Internet Address 172.16.10.3/24, Area 0
Process ID 1, Router ID 10.10.10.10, Network Type BROADCAST, Cost: 1
Enabled by interface configuration option
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 1.1.1.1, Interface address 172.16.10.1
Backup Designated Router (ID) 2.2.2.2, Interface address 172.16.10.2
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

If Router-A (the active DR) suddenly experiences a hardware failure and reboots, which role will Core-GW3 assume on this segment?

An engineer needs to configure two IPv6 static routes on a Cisco IOS router:
1. A static route to reach the remote network $2001:\text{db8}:3\text{c0d}:1::/64$ using the link-local address $\text{fe80}::1$ of the adjacent router connected via interface $\text{GigabitEthernet0/0/1}$.
2. A backup (floating) default static route via the global unicast next-hop address $2001:\text{db8}:\text{acad}:\text{f}::1$ with an Administrative Distance of $130$.

Which TWO IPv6 static route commands correctly fulfill these requirements?

Match each OSPFv2 network type or interface state on the left with its correct DR/BDR election requirement and default timer characteristics on the right.

A network engineer is configuring OSPFv2 between two Cisco routers connected over an Ethernet link. Which TWO parameters must match between the routers for an OSPFv2 neighbor adjacency to form successfully? (Select TWO.)

A Cisco router receives an IPv4 unicast packet and must select the best path from its routing table to forward the traffic. Arrange the steps in the correct sequential order that the router follows to evaluate candidate routes and make a forwarding decision.

An engineer initializes OSPFv2 process 10 on a Cisco router. At initialization, the router has active interfaces Loopback0 (IP address $10.10.10.10/32$) and GigabitEthernet0/0 (IP address $192.168.1.1/24$). No manual router ID is configured initially. Shortly after OSPF forms adjacencies, the engineer configures interface Loopback1 with IP address $172.16.50.1/32$ (up/up) and then executes the `router-id 1.1.1.1` command under the `router ospf 10` configuration prompt. Assuming the command `clear ip ospf process` has NOT been executed and the router has NOT been reloaded, what IP address is currently used as the active OSPF router ID?

A Cisco router receives an IPv4 packet destined for a remote subnet. Place the operational steps performed by the router to evaluate IPv4 static routes and forward the packet into the correct sequential order from first to last.

A network administrator configures OSPFv2 process 1 on router R4 without manually specifying an OSPF router ID. Prior to starting the OSPF process, R4 has the following operational interface statuses and IPv4 addresses:

- Loopback 0: 10.200.1.1/24 (Administratively Down, Line Protocol Down)
- Loopback 1: 172.16.5.1/24 (Up, Line Protocol Up)
- Loopback 2: 172.16.20.1/24 (Up, Line Protocol Up)
- GigabitEthernet 0/0: 192.168.1.254/24 (Up, Line Protocol Up)

What IPv4 address will R4 select as its OSPF Router ID?

A network administrator checks the OSPF status of a router interface connected to an Ethernet broadcast domain and observes the following output:

text
GigabitEthernet0/0 is up, line protocol is up
Internet Address 192.168.10.5/24, Area 0
Process ID 1, Router ID 10.1.1.5, Network Type BROADCAST, Cost: 1
State DROTHER, Priority 0
Designated Router (ID) 10.1.1.1, Interface address 192.168.10.1
Backup Designated router (ID) 10.1.1.2, Interface address 192.168.10.2

Based on this command output, what is the operational effect of configuring an OSPF priority of 0 on this interface?