Cisco CCNA Static and Dynamic Routing 3 — Questions and Answers
Question 1: Which statement correctly describes the difference between a routing protocol and a routed protocol?
- A routing protocol carries user data; a routed protocol builds the routing table
- A routed protocol carries user data while a routing protocol builds and maintains the routing table (Correct answer)
- Both terms describe the same function in modern networks
- A routed protocol is only used in IPv6 networks
Correct answer: A routed protocol carries user data while a routing protocol builds and maintains the routing table
Routed protocols like IP carry user traffic, while routing protocols like OSPF or EIGRP exchange routing information to populate the routing table.
Question 2: An OSPF router is in the 'Exstart' state. What is occurring at this stage?
- Routers are exchanging full LSA databases
- Routers are electing the master/slave relationship and establishing the initial DBD sequence number (Correct answer)
- The DR and BDR election is taking place
- Routers are verifying that LSA checksums match
Correct answer: Routers are electing the master/slave relationship and establishing the initial DBD sequence number
In the Exstart state, OSPF neighbors determine master/slave roles and agree on the initial Database Description sequence number before exchanging LSAs.
Question 3: What happens to EIGRP routes when the variance command is set to 2?
- Only routes with a metric exactly twice the successor's FD are added to the routing table
- Routes with a metric up to twice the successor's FD are eligible for unequal-cost load balancing (Correct answer)
- The EIGRP hello interval is doubled
- Routes are redistributed into OSPF with a seed metric of 2
Correct answer: Routes with a metric up to twice the successor's FD are eligible for unequal-cost load balancing
Setting variance to 2 allows EIGRP to install feasible successor routes whose FD is up to 2x the successor's FD for unequal-cost load balancing.
Question 4: Which command would you use to verify the OSPF neighbor state on a Cisco router?
- show ip route ospf
- show ip ospf database
- show ip ospf neighbor (Correct answer)
- show ip ospf interface brief
Correct answer: show ip ospf neighbor
The 'show ip ospf neighbor' command displays the neighbor ID, priority, state, dead time, address, and interface for all OSPF adjacencies.
Question 5: A router running RIPv2 receives an update with a hop count of 16 for a destination network. What does the router do with this route?
- Installs it in the routing table with the highest possible metric
- Considers the route unreachable and does not install it (Correct answer)
- Forwards the update to all neighbors without modification
- Converts the hop count to an EIGRP composite metric
Correct answer: Considers the route unreachable and does not install it
In RIP, a hop count of 16 means infinity (unreachable), so the router treats the route as invalid and removes or ignores it.
Question 6: Which type of OSPF LSA is generated by an ABR to describe routes in other areas?
- Type 1 - Router LSA
- Type 2 - Network LSA
- Type 3 - Summary LSA (Correct answer)
- Type 5 - AS External LSA
Correct answer: Type 3 - Summary LSA
ABRs generate Type 3 Summary LSAs to advertise networks from one OSPF area into another, summarizing inter-area routing information.
Question 7: When configuring route redistribution from OSPF into EIGRP on a Cisco router, what is required that is not needed when redistributing static routes into EIGRP?
- A route map must always be used
- A seed metric must be specified since OSPF metrics are incompatible with EIGRP's composite metric (Correct answer)
- The OSPF process ID must match the EIGRP AS number
- Redistribution from OSPF into EIGRP is not supported
Correct answer: A seed metric must be specified since OSPF metrics are incompatible with EIGRP's composite metric
EIGRP requires a seed metric when redistributing from protocols that use incompatible metrics, unlike static routes which inherit a default metric.
Cisco CCNA Static and Dynamic Routing 3
Which statement correctly describes the difference between a routing protocol and a routed protocol?