CCNA InterView Question and Answers

CCNA InterView Question and Answers

1. Identify 2 reasons for disabling CDP?

A.) If the router is not configured for RIP

B.) Save bandwidth by eliminating overhead

C.) If the router is configured forAppletalk

D.) When connected to a non-Cisco router

Ans B D

CDP can be disabled here are a couple of reasons. Connecting a Cisco router to a non-Cisco router. Don’t want to exchange CDP information to save bandwidth.

2 Identify 3 characteristics of ISDN?

A.) Transports voice and data

B.) Transports voice only

C.) Support both BRI and PRI

D.) Runs over existing phone lines

E.) Same as X.25

Ans A C D

ISDN supports voice, data, and video. It runs over existing phone lines and supports 128K (BRI) and T1 (PRI).

3. Identify the 3 characteristics of IGRP?

A.) Uses hop count as a metric

B.) Supports multiple unequal paths

C.) Administrative distance is 100

D.) Configured with an Autonomous system number

E.) Link state

Ans B C D

IGRP is a distance vector routing protocol, it’s degree of trustworthiness is 100, it can support up to 6 un-equal paths and must be configured with an autonomous system number.

4.Identify 2 features of PPP CHAP authentication?

A.) Username and password is sent in clear text

B.) Authentication messages are sent periodically during the connection

C.) Less secure then PAP

D.) Local router ‘challenges’ the remote router

Ans B D

PPP CHAP authentication message are sent periodically during the connection by challenging the other end of the connection.

It is more secure than PAP and passwords and username are encrypted.

5.Identify the default IPX serial encapsulation?

A.) Novell-Ether

B.) SDLC

C.) SNAP

D.) HDLC

Ans D

The default IPX serial encapsulation is HDLC.

6 .Identify the hardware component that stores the backup configuration?

A.) RAM

B.) NVRAM

C.) Flash

D.) ROM

Ans B

NVRAM contains the backup config. RAM is the dynamic memory area, ROM contains the boot strap code and Flash contains the IOS.

7. Identify the extended IP access-list number range?

A.) 600 - 699

B.) 1 - 99

C.) 900 - 999

D.) 100 - 199

Ans D

The extended IP access-list range is 100-199.

8. Identify 3 Fast Ethernet technologies?

A.) 100 Base FastEther

B.) 100 Base FX

C.) 100 Base T4

D.) 100 Base TX

Ans B C D

100 BaseFastEther is false. 100 Base FX, TX and T4 are all valid.

9 Identify the OSI layer which is responsible for end-to-end connections?

A.) Network

B.) Transport

C.) Session

D.) Data link

E.) TCP

Ans B

Layer 4 is the Transport layer and is responsible for end-to-end connections.

10 Identify the 2 characteristics regarding MAC addresses?

A.) Contains a network portion and host portion

B.) Always assigned by System Administrator

C.) 48 bits long

D.) Contains a vendor code and serial number

Ans C D

MAC addresses are assigned by the vendor. Each MAC address is 48 bits long and made up of 24 bits vendor code and 24 bits serial number.

11 Identify the number range for IPX SAP filters?

A.) 900 - 999

B.) 1000 - 1099

C.) 800 -899

D.) 100 - 199

Ans B

The IPX SAP filtering range is 1000-1099.

12 What is the purpose of ARP?

A.) IP to host name resolution

B.) Host name to IP address resolution

C.) Mac to IP address resolution

D.) IP to Mac address resolution

Ans D

Address Resolution Protocol resolves the MAC address if the IP address is known. It is a layer 3 protocol.

14 Which OSI layer establishes, maintains and terminates sessions between hosts?

A.) Application

B.) Physical

C.) Data-Link

D.) Presentation

E.) Network

F.) Session

Ans F

Layer 5 the Session layer performs this function.

15.Which statement is true regarding Administrative distance?

A.) It is a metric

B.) Number of hops between two routers

C.) Trustworthiness of the routing information

D.) RIP Administrative distance is 100

Ans C

Administrative distance is rating of trustworthiness of the routing information. The lower the AD the better the information.

16 Identify the purpose of the Ping command?

A.) Share routing information with a neighbor router

B.) Transmit user data when buffers are full

C.) Test connectivity at layer 3

D.) Test entire protocol stack

Ans C

The ping command tests layer 3 connectivity.

17 The Cisco IOS is stored where?

A.) ROM

B.) CD

C.) Flash

D.) NVRAM

Ans C

By default the Cisco IOS is stored in flash.

18 Sequence and acknowledgement numbers are used for?

A.) Layer transitioning

B.) Flow control

C.) Port number addressing

D.) Reliability

Ans D

TCP uses sequence numbers and acknowledgements to implement reliability.

19 Identify IPX GNS and it’s purpose?

A.) Go Network Server - sends a print job to a network server

B.) Get Nearest Server - locate the nearest server

C.) Guaranteed Network Services - allocates resources to users

D.) Get Notes Server - locates Domino Server

Ans B

GNS stands for Get Nearest Server, initiated by a workstation

20 Identify the true statement regarding subnetting?

A.) Allows for more host address

B.) Borrow bits from the network portion of the address

C.) Allows for unlimited number of networks

D.) Borrow bits from the host portion of the address

Ans D

Subnetting involves borrowing bits for the host portion of the address to be used to subnet addressing.

21 Inverse ARP serves what purpose?

A.) Method for a local router to introduce itself to the remote end of the connection

B.) Broadcast a routing table update

C.) Identify MAC addresses if the IP address is known

D.) Sent every 10 seconds used to verify the Frame Switch is still active

Ans A

Inverse ARP operates in a Frame Relay network so the two end points can identify themselves to each other.

22 Identify 3 characteristics of a MAC address?

A.) Burned into the NIC

B.) 48 bits long

C.) Length is 32 bits

D.) Used to deliver the frame to the end device

E.) Contains a network portion and a host portion

Ans A B D

The MAC address is 48 bits long not 32. It does NOT contain a network and host portion with the address. It is used to deliver the frame to the destination device.

23 Identify 3 IP routing protocols?

A.) RIP

B.) AURP

C.) OSPF

D.) IGRP

E.) ARP

F.) ICMP

Ans A C D

AURP and ICMP are not routing protocols.

24 Identify the type of routing protocol that exchanges entire routing tables at regular intervals?

A.) Link state

B.) Interior gateway protocols

C.) Appletalk routing

D.) Distance vector

Ans D

Distance Vector routing protocols exchange entire routing tables with it’s neighbors. Link State routing protocols exchange LSP’s to share information regarding the networks they know.

25 Identify the type of hardware required to connect a Token ring network to an Ethernet network?

A.) Repeater

B.) TR-Enet

C.) Router

D.) Token Ring to Ethernet translation hub

Ans C

Routers are used to connect dissimilar networks with different access-methods, like connecting Token Ring to Ethernet.

26 Identify 3 characteristics regarding CDP?

A.) On by default

B.) Shows only directly connected neighbors

C.) Requires IP or IPX

D.) 60 second update interval by default

E.) 30 second updates interval by default

Ans A B D

CDP stands for Cisco Discovery Protocol. It is used to discover directly connected neighbors, it is on by default and has a 60 second update interval by default.

27 Identify 2 transport layer protocols?

A.) IP

B.) TCP

C.) CDP

D.) ARP

E.) UDP

Ans B E

TPC and UDP are 2 layer4 Transport protocols.

28 Identify 2 features of X.25?

A.) Supports only IP

B.) Utilizes switched and permanent virtual circuits

C.) Contains minimal flow control and error recovery

D.) Utilizes LAPB as it’s data-link protocol

Ans B D

X.25 utilizes LAPB and uses switched and permanent VC’s. It supports multiple layer protocols and is heavy laden with error detection and correction mechanisms.

29 Identify the purpose of the Trace command?

A.) Explorer packet transmitting routing information

B.) Test connectivity

C.) Determine the path a packet is taking through the network

D.) Transmits user data when buffers are full

Ans C

The trace command is used to determine the path a packet has taken through the network.

30 Identify the purpose of the TCP 3 step handshake?

A.) Setup a un-reliable connection

B.) Initialize routing tables

C.) Synchronize sequence numbers between hosts

D.) Connection tear down process

Ans C

The 3 step handshake establishes the parameters required for a TCP connection. During the handshake process sequence numbers are synchronized allowing for the end points to properly acknowledge and re-assemble the segments.

31 Identify 2 PPP characteristics?

A.) Is proprietary to Cisco

B.) Supports authentication

C.) Support compression

D.) Run on a multi-access network

Ans B C

PPP supports authentication; PAP and CHAP. It also supports compression; Stacker and Predictor.

32 Which statement is true regarding half duplex?

A.) Only works in a point-to-point configuration

B.) Allows for transmitting and receiving but not a the same time

C.) Allow for transmitting and receiving of data simultaneously

D.) Doubles the bandwidth

Ans B

Half duplex is analogous to a single a lane bridge, it can handle traffic in both directions but no at the same time.

33 Identify the purpose of the wildcard mask?

A.) Match a certain portion of the IP address while ignoring the rest of the address

B.) Determine the class of the IP address

C.) Determine the network portion of an IP address

D.) Hide the host portion of an IP address

Ans A

The purpose of the wildcard mask to match a certain portion of the IP address while ignoring the rest.

34 Identify the OSI layer associated with bits?

A.) Physical

B.) Network

C.) Binary

D.) Data link

Ans A

The Physical layer converts the frames to bits.

35 Identify the type of routing protocol that maintains a topological database of the network?

A.) Topological state

B.) Shortest Path First

C.) Link state

D.) Distance vector

Ans C

Link State routing protocols maintain a database that lists all the networks in the internetwork.

36 Identify the 3 major functions at layer 3 of the OSI model?

A.) Forwarding process

B.) Logical addressing

C.) End-to-end connections

D.) Path selection

E.) MAC address examination

F.) Network monitoring

Ans A B D

Layer 3 determines the path, forwards the packet and implements software or logical addressing.

37 Identify the 2 rules used when configuring a Distance Vector routing protocol?

A.) Physically connected network(s)

B.) Configure the classful address, no subnets

C.) Enable CDP so neighbors can be detected

D.) Configure all networks in Area0

Ans A B

When configuring a Distance Vector routing protocol only assign the physically connected networks with the classful address only.

38 Identify 3 characteristics of an IP address?

A.) Contains a network portion and a host portion

B.) 32 bits long

C.) Unique to each network

D.) Part of the default Cisco configuration

E.) Referred to as the hardware address

Ans A B C

An IP address is 32 bits long, it is referred as the logical or software address. It contains a network and host portion. Each IP address is unique.

39 Identify 3 feature of access-lists?

A.) Implicit deny will deny any packets not matched

B.) Processed sequentially from bottom to top

C.) Processed sequentially from top to bottom

D.) If a packet is denied it would be tested against the remaining statements in the access-list

E.) Once a match is made the packet is either denied or permitted

F.) Enabled on all interfaces by default

Ans A C E

Access-list are processed from top to bottom, once a match occurs the packet is either denied or permitted and is no longer tested and if no match occurs the packet is denied via the implicit deny.

40 Which OSI layer performs code conversion, code formatting and encryption?

A.) Physical

B.) Data-Link

C.) Application

D.) Transport

E.) Presentation

F.) Network

Ans E

Layer 6 the Presentation layers performs this function.

41 Identify the order of the 5 step encapsulation?

1. Create the segment

2. Convert the frame to bits

3. Create the packet

4. Create the frame

5. User creates the data

A.) 1,2,4,2,5

B.) 2,1,3,4,5

C.) 5,1,3,4,2

D.) 5,3,4,1,2

Ans C

Cisco 5 step encapsulation.

1) User creates Data

2) Data is converted into a segment at layer 4

3) The segment is converted to packet at layer 3

4) The packet it converted into a frame at layer 2

5) The frame is converted into bits at layer 1