Practise interpreting routing-table output, route selection, administrative distance, metrics, next hops and longest-prefix match.
Start Scenario PracticeA network engineer is configuring EIGRP on a router that connects to a service provider network. The engineer wants to advertise a default route to internal routers. The engineer configures 'ip default-network 0.0.0.0' and redistributes a static default route into EIGRP. However, internal routers are not receiving the default route. The engineer checks the EIGRP topology table and sees the default route with a metric of 1. What is the most likely reason?
Explanation: The engineer's configuration includes both 'ip default-network 0.0.0.0' (which is an IGRP command, not EIGRP) and redistribution of a static default route. The appearance of the default route in the EIGRP topology table with metric 1 indicates that redistribution occurred, but the route is not being advertised to internal routers. The most likely reason is that the static default route itself is not correctly configured. For EIGRP redistribution to succeed, the static route must point to a valid next-hop IP address using the syntax 'ip route 0.0.0.0 0.0.0.0 <next-hop>'. If the engineer used an interface instead of a next-hop, or the next-hop is unreachable, the static route may be invalid or not installed in the routing table, preventing its advertisement to EIGRP neighbors.
A network administrator is troubleshooting a BGP routing issue where routes from an eBGP neighbor are not being installed in the routing table. The 'show ip bgp' output shows the routes are received but not valid. What is the most likely cause?
Explanation: For a BGP route to be considered valid and installed in the routing table, the next-hop IP address must be reachable via an IGP or a static route. If the next hop is not reachable, the route will appear in the 'show ip bgp' output but will be marked as not valid (often with a 'r' for received but not valid). This is the most common cause when routes are received from an eBGP neighbor but not installed.
Drag and drop the steps of EIGRP redistribution from OSPF with metric seeding into the correct order, from first to last.
Explanation: When redistributing OSPF into EIGRP with metric seeding, the correct order is: First, enter EIGRP router configuration mode (A). Second, if using named mode, specify the address-family (B). Third, set the default-metric (D) before redistribution to ensure routes receive proper metric values. Fourth, issue the 'redistribute ospf process-id' command (C). Finally, verify with 'show ip eigrp topology all-links' (E).
Drag and drop the steps of OSPF redistribution from EIGRP with metric conversion into the correct order, from first to last.
Explanation: First, identify the EIGRP routes to redistribute into OSPF. Then, configure the OSPF redistribution command under the OSPF process, specifying the EIGRP AS number. Since OSPF requires a metric for redistributed routes, set the OSPF metric type (E1 or E2) and seed metric. Optionally, use a route map to filter or modify specific routes. Finally, verify that the redistributed routes appear in the OSPF database and routing table.
A service provider is migrating a customer from a global routing table to a VRF on a Cisco ASR 1000. The customer has a BGP session with the provider for internet access. After moving the customer's interface to VRF CUSTOMER_D, the BGP session goes down. The engineer verifies that the VRF is configured with the correct route-target and that the BGP neighbor is configured under address-family ipv4 vrf CUSTOMER_D. What else is missing?
Explanation: When a VRF is applied to an interface on a Cisco ASR 1000, the interface's IP address is removed because the VRF changes the routing context. The engineer must reconfigure the IP address under the VRF interface. Without the IP address, the BGP session cannot establish a TCP connection, causing it to go down.
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Practice all Show IP Route Output Practice QuestionsPractise interpreting routing-table output, route selection, administrative distance, metrics, next hops and longest-prefix match. These appear throughout the 350-401 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-401. Practicing each scenario type ensures you're ready for any format.
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