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Q:

Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?

A) Switch (config) #switchport trunk encapsulation ietf	B) Switch (config) #switchport trunk encapsulation dot1q
C) Switch (config-if) #switchport trunk encapsulation ietf	D) Switch (config-if) #switchport trunk encapsulation dot1q

Answer & Explanation Answer: D) Switch (config-if) #switchport trunk encapsulation dot1q

Explanation:

If you are on a 2950 switch, then the interface command is just swichport mode trunk since the 2050 can only run the IEEE 802.1q version. However, a 3550 can run both ISL and 802.1q, so you must also use the encapsulation command. The argument to choose 802.1q for a trunking protocol is dot1q.

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Q:

There are three possible routes for a router to reach a destination network. The first route is from OSPF with a metric of 782. The second route is from RIPv2 with a metric of 4. The third is from EIGRP with a composite metric of 20514560. Which route will be installed by the router in its routing table?

A) RIPv2	B) EIGRP
C) OSPF	D) All three

Answer & Explanation Answer: B) EIGRP

Explanation:

Only the EIGRP routes will be placed in the routing table because it has the lowest administrative distance (AD), and that is always used before metrics.

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Q:

You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers need to be checked. What command will display the required information?

A) show ip eigrp adjacency	B) show ip eigrp topology
C) show ip eigrp interfaces	D) show ip eigrp neighbors

Answer & Explanation Answer: D) show ip eigrp neighbors

Explanation:

The show ip eigrp neighbors command allows you to check the IP addresses as well as the retransmit interval and queue counts for the neighbors that have established an adjacency.

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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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