ccna interview questions and answers

Part - 55 CCNA Interview Questions and Answers

401 Which of the following are characteristics of UDP?

A.) UDP is connection oriented.

B.) UDP is used with TFTP.

C.) UDP is unreliable.

D.) UDP is connectionless.

E.) UDP is at the transport layer.

F.) UDP uses no acknowledgements.

Ans B C D E F

UDP sends packets 'blind' down the network, and relies on upper-layer protocols to form connections and detect errors. TCP is a connection-oriented protocol that can provide reliable transport.

402 What is a characteristic of Store and Forward switches?

A.) They work at wire speed.

B.) They are the same as Cut-Through switching in 'prune' mode.

C.) They forward based on transport layer info.

D.) They forward the frame before it is completely read.

E.) They increase latency.

Ans E

Store and froward will not forward fragments. The longer the packet, the longer the delay (latency) in the switch. There is no such thing as 'prune' mode.

403 The Internet Protocol (IP) occurs at what layer of the seven layer model?

A.) Physical

B.) Presentation

C.) Network

D.) Datalink

E.) Session

F.) Transport

Ans C

IP is a routed protocol that occurs at layer 3. Other layer 3 protocols include IPX, APPLETALK, and DECNET.

404 In regards to TCP/IP, which class of address allows for the fewest valid Internet hosts?

A.) D

B.) E

C.) Classes are not used in TCP/IP. D.) B E.) C F.) A

Ans E

Class A = 16.7 million hosts Class B = 65,534 hosts Class C = 254 hosts

405 For IPX, what is the DEFAULT Cisco Encapsulation on an Ethernet interface?

A.) novell-ether

B.) gns

C.) snap

D.) arpa

E.) sap

F.) dix
Ans A

At the time when Cisco first supported IPX, Novell-Ether (Novell proprietary 802.3 'raw') was the default frame type for NetWare 2.x and 3.x file servers. Now, Novell has changed their default frame type to 802.2 (which is really IEEE 802.3 Ethernet, with LLC 802.2 headers).

406 Novell NetWare has an Ethernet frame type called Ethernet_II. What is the matching Cisco command line keyword for this encapsulation method?

A.) dix

B.) sap

C.) arpa

D.) gns

E.) snap

F.) novell-ether

Ans C

Novell 802.2 = sap (contains 802.2 LLC headers) Novell 802.3 = novell-ether (NetWare proprietary) Ethernet_II = arpa (the Internet standard) snap = snap (field type set to 'AA')

407 There are 2 types of PPP authentication supported by the Cisco IOS. What are they?

A.) PAP

B.) PREDICTOR

C.) MD5

D.) CHAP

E.) STACKER

F.) MSCHAP

Ans A D

Router(config-if)#ppp authentication ? chap Challenge Handshake Authentication Protocol (CHAP) pap Password Authentication Protocol (PAP)

408 Which of the following are examples of the Transport Layer?

A.) Token Ring

B.) UDP

C.) TCP

D.) IP

E.) SQL

F.) LLC

Ans B C

TCP is connection oriented. UDP is connectionless.

409 Which of the following describe SMTP?

A.) Used for downloading files to the router.

B.) Used for sending e-mail.

C.) Uses TCP.

D.) Uses UDP.

E.) Uses port 25.

F.) Used for managing IP devices.

Ans B C E

Send / Simple (depending on literature) Mail Transport Protocol (SMTP) is used for delivering mail to other mail servers. It uses port 25, and relies on TCP. POP 3 (Post Office Protocol version 3) is used for retrieving mail from mail servers to clients.

410 What is the standard ISDN term for a native ISDN modem?

A.) ET

B.) LE

C.) TE2

D.) TE3

E.) TA

Ans E

The marketing term 'ISDN modem' was created to help sell the ISDN idea to America. There is no such thing as an analog modulator demodulator for digital ISDN. The Terminal Adapter (TA) allows you to connect a PC to a digital ISDN line directly. In the real world, ISDN is digital, modems are analog.

411Which of the following are Transport layer protocols?

A.) UDP

B.) TCP

C.) NBP

D.) IP

E.) SPX

Ans A B C E

TCP (Transmission Control Protocol) and UDP are used by TCP/IP. SPX (Sequenced Packet Exchange) is used with IPX. NBP (Name Binding Protocol) is used with Appletalk.

412 When determining whether or not to route a LAN segment, which rule of thumb do you use?

A.) 60/40

B.) 50/50

C.) 80/20

D.) 90/10

E.) 70/30

Ans E

The industry standard rule is 80/20, which means 80% local, 20% over the router. However, according to Cisco's online documentation, the answer is 70/30. This makes sense, considering more and more traffic is starting to go from the desktop to an ultimate destination outside the local are network, such as the Internet.

413 Which of the following are examples of the Session Layer?

A.) TCP

B.) LLC

C.) SQL

D.) NFS

E.) Token Ring

Ans C D

Session layer examples include Netbios Names, SQL, NFS, X Windows, and RPC.

414 Which layer of the 7 layer model provides services to the Application layer over the Session layer connection?

A.) Transport

B.) Application

C.) Session

D.) Network

E.) Datalink

F.) Presentation

Ans F

The OSI Presentation layer is sandwiched between the Application and Session layers.

415 What type of switching creates variable latency through the switch?

A.) Cut-Through

B.) Inverted

C.) Layer 4

D.) Multiplexed

E.) Store and Forward Ans E DEFINITION: Latency = Delay. Because a store and forward switch reads the whole frame before forwarding,a larger frame takes longer than a shorter frame.

416 The network portion of an address typically represents a:

A.) Router

B.) Ethernet MAC address.

C.) Computer

D.) Host

E.) Segment

Ans E

Every network segment is represented by a network or subnetwork address.

417 The Physical layer works with which of the following:

A.) Segments

B.) Datagrams

C.) Packets

D.) Bits

E.) Frames

Ans

D Physical - bits Datalink - frames Network - packets

418 Which of the following is an example of the Network Layer?

A.) LLC

B.) SQL

C.) Token Ring

D.) IPX E.) SPX

Ans D

Most protocol suites have different OSI layer protocols within them. At layer 3, IP is for TCP/IP. TCP is layer 4. IPX is for IPX/SPX. SPX is layer 4. DDP is for Appletalk

419 When setting up a frame-relay network between a Cisco router and a non-Cisco router, what encapsulation type should you use?

A.) SAP

B.) CISCO

C.) IANA

D.) Apollo

E.) IETF

F.) Q933A

Ans E

The Internet Engineering Task Force (IETF) encapsulation method is the standard encapsulation type for Frame Relay. Cisco routers default to the CISCO encapsulation method, because it was created before there was a standard.

420 A user device that connects to a DCE must be which of the following?

A.) DTE

B.) CPE

C.) Demarc

D.) DCE

E.) CO

Ans A

DTE's are the router side, and receive clocking. DCE's are the DSU/CSU side, and provide clocking. It may or may not be Customer Premises equipment.

421 What does the parameter -- LOG -- do on an IPX access list?

A.) The log keyword is not a valid option.

B.) Read the LOG to figure out what traffic to deny.

C.) Logs the creation of the access list.

D.) Logs IPX access control list violations whenever a packet matches a particular access list entry.

E.) Ensures the IPX protocol places a log in the fireplace.

Ans D

Router(config)#access-list 900 deny any ? log Log matches against this entry

422 Given the global configuration commands: 'banner motd #' 'Hello #' When would the message be displayed?

A.) The message of the day banner shows up before login.

B.) The message of the day banner shows up during logoff.

C.) These commands are not the right syntax for MOTD. D.) Message of the day banners are displayed upon entering global config mode.

E.) Message of the day banners are not possible.

F.) The message of the day would be, 'Hello #'

Ans A

Message of the day banners are displayed when a user logs on to the router. In the example above, the '#' is the unique delimiting (terminating) character. In this way, banners can have multiple lines, terminated not by hitting , but rather by the chosen (unique) delimiting character.

423 Which ISDN specification deals with call Setup and Teardown?

A.) Q-Series

B.) J-Series

C.) I- Series

D.) C- Series

E.) F-Series

Ans A

The 2 most important ISDN specifications are Q & I: Q = Call setup and teardown. I = Concepts and terminology.

424 All equipment located at the customers site is called:

A.) CPE

B.) CO

C.) DCE

D.) Demarc

E.) DTE

Ans A

CPE - Customer Premise Equipment

425 Which layer allows multiple Ethernet devices to uniquely identify one another on the Datalink layer?

A.) Transport

B.) Session

C.) Network

D.) Datalink - MAC Sublayer

E.) Datalink - LLC Sublayer

Ans D

Ethernet MAC addresses are 48 bits long, and provide a unique hardware identifier.