Q:

What is the administrative distance of OSPF?

A) 90 B) 100
C) 110 D) 120
 
Answer & Explanation Answer: C) 110

Explanation:

The administrative distance (AD) is a very important parameter in a routing protocol. The lower the AD, the more trusted the route. If you have IGRP and OSPF running , by default IGRP routes would be placed in the routing table because IGRP has a lower AD of 100. OSPF has an AD of 110. RIPv1 and RIPv2 both have an AD of 120, and EIGRP is the lowest, at 90.

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Q:

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a  loopback interface?

A) The Lowest IP address of any physical interface B) The Highest IP address of any physical interface
C) The Lowest IP address of any logical interface D) The Highest IP address of any logical interface
 
Answer & Explanation Answer: B) The Highest IP address of any physical interface

Explanation:

At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router . If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.

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Q:

When a PC sends a packet to another PC in a remote network, what destination IP address and MAC address will be in the frame that it sends to its default gateway?

Answer

It will use the gateway interface MAC at L2 and the actual destination IP at L3. 

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Q:

Two connected routers are configured only with RIP routing. What will be the result when a router receives a routing update that contains a higher-cost path to a network already in its routing table?

A) The updated information will be added to the existing routing table B) The update will be ignored and no further action will occur
C) The updated information will replace the existing routing table entry D) The existing routing table entry will be deleted from the routing table and all routers will exchange routing updates to reach convergence
 
Answer & Explanation Answer: B) The update will be ignored and no further action will occur

Explanation:

When a routing update is received by a router, the router first checks the administrative distance (AD) and always chooses the route with the lowest AD. However, if two routes are received and they both have the same AD and differing metrics , then the router will choose the one route with the lowest metrics or , in RIP's case, hop count.

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Q:

If your routing table has a static, a RIP, and an EIGRP route to the same network, which route will be used to route packets by default?

A) Any available route B) RIP route
C) Static route D) EIGRP route
 
Answer & Explanation Answer: C) Static route

Explanation:

Static routes have an administrative distance of 1 by default. Unless you change this, a static route will always be used over any other dynamically learned route. EIGRP has an administrative distance of 90, and RIP has an administrative distance of 120, by default

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Q:

What metric does RIPv2 use to find the best path to a remote network?

A) Hop count B) MTU
C) Cumulative interface delay D) Load
 
Answer & Explanation Answer: A) Hop count

Explanation:

RIPv1 and RIPv2 only use the lowest hop count to determine the best path to a remote network.

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Q:

A network administrator views the output from the show ip route command. A network that is advertised by both RIP and EIGRP appears in the routing table flagged as an EIGRP route. why is the RIP route to this network not used in the routing table?

A) EIGRP has a faster update timer B) EIGRP has a lower administrative distance
C) RIP has a higher metric for that route D) The RIP path has a routing loop
 
Answer & Explanation Answer: B) EIGRP has a lower administrative distance

Explanation:

RIP has an administrative distance (AD) of 120, while EIGRP has an administrative distance of 90, so the router will discard any route with a higher AD than 90 to that same network.

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Q:

Which command displays RIP routing updates?

A) Show ip route B) debug ip rip
C) show protocols D) Debug ip route
 
Answer & Explanation Answer: B) debug ip rip

Explanation:

Debug ip rip is used to show the internet Protocol (IP) Routng Information protocol (RIP) updates being sent and received on the router.

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