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Q:

Given the following network range 192.168.0.0/24. We want minimum 50 hosts on each of the available subnets. What will be the subnet mask?

A) /24 B) /25
C) /26 D) /27
 
Answer & Explanation Answer: C) /26

Explanation:

Explanation: 50 hosts require 6 bits of the last octet giving us 64 -2 = 62 possible hosts this satisfies our requirement and leaves us 2 bits over for the subnets. The default mask is /24 or 255.255.255.0 adding the 2 bits for the subnets it becomes 255.255.255.192 or /26

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Q:

What is the meaning of amber SYST led on a 2960 switch?

A) This is normal operation B) There is a bridging loop
C) The switch IOS is loading D) The switch failed its POST
 
Answer & Explanation Answer: D) The switch failed its POST

Explanation:

Explanation: When the switch failed its POST, Power-On Self Test, the SYST led will turn amber and the IOS did not load

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Q:

Which of the following symbols indicate that a ping was successful?

A) ! B) .
C) ? D) U
 
Answer & Explanation Answer: A) !

Explanation:

Explanation: The following table explains the output generated by ping:

! – reply received

. – timed out

U – unreachable

C – congestion

? – unknown packet type

& packet lifetime exceeded

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Q:

Why is BGP a better choice for Internet routing than the IGPs?

Answer

RIP version 1 and IGRP are classful protocols and do not advertise subnet mask information. RIP version 2 has a limited network diameter of 15 hops. EIGRP, OSPF, and IS-IS use computational intensive algorithms for determining a shortest path. BGP relies on simple techniques for best path selection and loop detection, and can handle the number of network prefixes required for Internet routing.

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Subject: CCNP

Q:

Explain the difference between the forwarding of a unicast IP packet and the forwarding of a multicast IP packet.

Answer

Unicast IP packets are forwarded based on the destination IP address. Multicast packets are forward based on the source IP address. If a multicast packet is received on the interface used to send a unicast packet back to the source, the multicast packet is forwarded to multicast neighbors. If the multicast packet is received on an interface that would not be used to send a unicast IP packet back to the source, the packet is discarded.

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Subject: CCNP

Q:

What is the first thing that BGP checks to determine if a prefix is accessible?

Answer

BGP checks the NEXT_HOP attribute to determine if the NEXT_HOP is accessible or in the IP routing table.

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Subject: CCNP

Q:

Explain the difference between a classful and a classless routing protocol.

Answer

Classless routing protocols advertise subnet mask information along with the network prefixes. Classful routing protocols do not. Therefore, for a classful protocol, all subnets for the major network number being used must be the same length. Also, classful protocol cannot support discontiguous networks prefixes.

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Subject: CCNP

Q:

Why are multiple protocols used, such as a package, addressing, delivery, and transportation, instead of using one protocol defining everything?

Answer

Using multiple protocols is modular and allows changes to one protocol without affecting the others. For example, if the addressing protocol is dependent on the delivery protocol, changes to one would imply changes need to be made to the other.

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Subject: CCNP