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.)
- 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.Answer
- 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.Answer
- CConfiguring a static route with an administrative distance of 110 creates a primary route that overrides an existing OSPF route for the same network prefix.
- DConfiguring a static route using an exit interface on a multiaccess network eliminates the need for recursive routing lookups while optimizing ARP table performance.
Answer
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.
Step-by-Step Solution
Key Concept
IPv4 Static Routing Next-Hop Resolution and Exit Interface Selection