199+ CCNA Questions and Answers with Explanation For Exams, Interview

Q:

How many non- overlapping channels are available with 802.11b?

A) 3	B) 12
C) 23	D) 40

Answer & Explanation Answer: A) 3

Explanation:

The IEEE 802.11b standard provides three non-overlapping channels.

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Q:

You need to configure a router for a Frame Relay connection to a non-Cisco router. Which of the following commands will prepare the WAN interface of the router for this connection?

A) Router (config-if) #encapsulation frame-relay q933a	B) Router (config - if) #encapsulation frame-relay ansi
C) Router (config - if) #encapsulation frame-relay ietf	D) Router (config - if) #encapsulation frame-relay cisco

Answer & Explanation Answer: C) Router (config - if) #encapsulation frame-relay ietf

Explanation:

If you have a Cisco router on one side of a Frame Relay network and a non-Cisco router on the otherside, you would need to use the Frame Relay encapsulation type of IETF. The default is Cisco encapsulation, which means that a Cisco router must be on both sides of the Frame Relay PVC.

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Q:

Which of the following protocols uses both TCP and UDP?

A) FTP	B) SMTP
C) Telnet	D) DNS

Answer & Explanation Answer: D) DNS

Explanation:

DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.

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Q:

A network administrator needs to configure a router with a distance-vector protocol that allows classless routing. Which of the following satisfies those requirements?

A) IGRP	B) OSPF
C) RIPv1	D) EIGRP

Answer & Explanation Answer: D) EIGRP

Explanation:

In this question, we're calling EIGRP just plain old distance vector. EIGRP is an advanced distance-vector routing protocol, sometimes called a hybrid routing protocol because it uses the characteristics of both distance-vector and link-state routing protocols.

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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:

Suppose you have a customer who has a central HQ and six branch offices. The customer anticipates adding six more branches in the near future. It whishes to implement a WAN technology that will allow the branches to economically connect to HQ and you have no free ports on the HQ router. which of the following would you recommend?

A) PPP	B) HDLC
C) Frame Relay	D) ISDN

Answer & Explanation Answer: C) Frame Relay

Explanation:

The key is "there are no free ports" on your router. Only Frame Relay can provide a connection to multiple locations with one interface, and in an economical manner no less.

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Q:

A static map to the S-AMER location is required. Which command should be used to create this map?

A. frame-relay map ip 172.16.1.3 704 broadcast
B. frame-relay map ip 172.16.1.3 196 broadcast
C. frame-relay map ip 172.16.1.3 702 broadcast
D. frame-relay map ip 172.16.1.3 344 broadcast

Answer

Answer: B

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Q:

Which encryption type does WPA2 use?

A) AES - CCMP	B) PPK via IV
C) PSK	D) TKIP/MIC

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