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Zorluk: OrtaIPv4 Static Routing

An administrator is configuring IPv4 static routes on a Cisco IOS router connected to adjacent networks via both point-to-point serial and multiaccess Ethernet interfaces. Which two statements correctly describe the behavior of these IPv4 static route configurations? (Select two.)

  1. Configuring a static route specifying only an Ethernet exit interface forces the router to resolve destination IP addresses using ARP, increasing ARP table size and processing overhead.Cevap
  2. Configuring a static route specifying only a next-hop IP address requires the router to perform a recursive lookup in the routing table to identify the outgoing interface.Cevap
  3. C
    Configuring a static route with an administrative distance of 110 creates a primary route that overrides an existing OSPF route for the same network prefix.
  4. D
    Configuring a static route using an exit interface on a multiaccess network eliminates the need for recursive routing lookups while optimizing ARP table performance.

Cevap

The correct statements are that specifying only an Ethernet exit interface forces the router to resolve destination host IPs using ARP (increasing processing and memory load), and specifying only a next-hop IP address requires a recursive lookup in the routing table to determine the egress interface.
Specifying only an Ethernet exit interface causes the router to issue ARP requests for every destination IP address, inflating the ARP table. Specifying only a next-hop IP address forces the router to perform a recursive routing lookup to identify the appropriate outbound interface.

Adım Adım Çözüm

1
Analyze static route next-hop IP resolution behavior
Identified that next-hop static routes require a recursive lookup step
When a route specifies only a next-hop IP address, the router must search its routing table again to find the interface through which that next-hop address is reachable.
2
Analyze static route exit-interface behavior on multiaccess networks
Identified that specifying only an exit interface on Ethernet causes excessive ARP requests
On multiaccess segments, omitting the next-hop IP causes the router to treat every remote destination host IP as directly attached to the local link, triggering ARP resolution for each destination.
3
Evaluate administrative distance for route selection
Identified that an administrative distance of 110 does not take precedence over OSPF
OSPF uses a default administrative distance of 110. To override an OSPF route, a static route must have a lower administrative distance (e.g., default AD of 1).

Anahtar Kavram

IPv4 Static Routing Next-Hop Resolution and Exit Interface Selection
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Konular

IPv4 Static Routing

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