ICND1 Routing Technologies & Protocols 2 — Questions and Answers
Question 1: Which OSPF packet type is used to discover and maintain neighbor relationships?
- DBD
- LSR
- Hello (Correct answer)
- LSU
Correct answer: Hello
OSPF Hello packets are sent periodically to discover neighbors and verify adjacency is maintained.
Question 2: A router has two routes to 192.168.10.0/24: one via OSPF with metric 20 and one via RIP with metric 5. Which route is installed in the routing table by default?
- RIP route, because it has a lower metric
- OSPF route, because OSPF has a lower AD of 110 (Correct answer)
- Both routes are installed via load balancing
- RIP route, because RIP has a lower AD of 120
Correct answer: OSPF route, because OSPF has a lower AD of 110
Administrative Distance is compared before metric; OSPF AD 110 is lower than RIP AD 120, so the OSPF route wins.
Question 3: What is the default OSPF hello interval on a broadcast multi-access network?
- 5 seconds
- 10 seconds (Correct answer)
- 30 seconds
- 40 seconds
Correct answer: 10 seconds
The default OSPF Hello interval on broadcast and point-to-point links is 10 seconds.
Question 4: Which command enables OSPF process 1 and places interface 192.168.1.0/24 into area 0?
- router ospf 1 / network 192.168.1.0 0.0.0.255 area 0 (Correct answer)
- router ospf area 0 / network 192.168.1.0 255.255.255.0
- ospf enable 1 / area 0 network 192.168.1.0
- router ospf 1 / network 192.168.1.0 255.255.255.0 area 0
Correct answer: router ospf 1 / network 192.168.1.0 0.0.0.255 area 0
The network command under OSPF uses a wildcard mask, not a subnet mask, followed by the area number.
Question 5: What does the EIGRP term 'feasible successor' refer to?
- The route currently in the routing table
- A backup route that meets the feasibility condition (Correct answer)
- The router that originates a route
- A route with equal cost to the successor
Correct answer: A backup route that meets the feasibility condition
A feasible successor is a backup path whose reported distance is less than the successor's feasible distance, stored in the topology table.
Question 6: Which routing protocol uses the Bellman-Ford algorithm?
- OSPF
- EIGRP
- RIP (Correct answer)
- IS-IS
Correct answer: RIP
RIP uses the Bellman-Ford distance-vector algorithm to calculate routes.
Question 7: A static route is configured with an administrative distance of 254. What is the purpose of this high AD value?
- To make the route preferred over all dynamic routes
- To create a floating static route used only if the dynamic route fails (Correct answer)
- To prevent the route from being redistributed
- To increase the route's metric in the routing table
Correct answer: To create a floating static route used only if the dynamic route fails
A floating static route has a higher AD than dynamic routes so it only enters the routing table when the dynamic route is removed.
ICND1 Routing Technologies & Protocols 2
Which OSPF packet type is used to discover and maintain neighbor relationships?