CCNA基础知识题(英文版）

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901. What do you use the Aux port for?
A.) Console B.) Terminal editing C.) Modem D.) Backup logging

Ans C

902. The CSMA/CD Ethernet IEEE committee is defined as which of the
following?
A.) 802.2 B.)

802.3 C.)
802.4 D.)
Ans B

903 How many Frame-relay encapsulation types are available with Cisco routers?

A.) Four B.)
Two C.) Five
D.) Three

Ans B

904. What is the maximum hop count for Link-State protocols?
A.) 15 B.) there is no hop count limit C.) 256 D.) 16

Ans B

905. What information can you get from CDP info: (choose all that apply)
A.) Hardware platform B.) One address per protocol C.) Software platform D.) Hostname
E.) The same info as show version F.) Incoming/outgoing port

Ans A B C D F

906 How does the cut-through switching technique work?

A.) By using broadcast address as source addresses B.) The switch waits only for the header
to be received before it checks the destination address and starts forwarding the packets
C.) The LAN switch copies the entire frame into its onboard buffers and then looks up the
destination address in its forwarding, or switching, table and determines the outgoing
interface D.) By using a Class I repeater in a collision domain

Ans B

907. What is the protocol number for TCP?
A.) 80 B.) 21
C.) 11 D.) 6

Ans D

908. Which of the following are Presentation Layer standards?
A.) JPEG and PICT B.) MPEG and MIDI C.) ASCII and EBCDIC D.) NFS and SQL

Ans A B C

909. What is the administrative distance for RIP?
A.) 100 B.) 90
C.) 120 D.)

Ans C

910 IP standard access lists use which of the following as a basis for
permitting or denying packets?

A.) destination address B.) port C.) protocol D.) source address

Ans D

911 If a frame is received at a switch and only the destination hardware
address is read before the frame is forwarded, what type of switching
method is this?

A.) Store-and-drop B.)
Latency C.)
Store-and-forward D.)
Cut-through

Ans D

912. What is the purpose and default value of the CDP timer command?
A.) 90 seconds; interval before an entry expires B.) 60 seconds; interval between updates
C.) 60 seconds; interval before an entry expires D.) 90 seconds; interval between updates

Ans B

913. Choose the following that are benefits to segmenting with router:
A.) Flow Control B.) Manageability C.) Multiple Active Paths D.) Explicit packet lifetime
control

Ans B C

914. When discussing static routes, what is the gateway parameter used for?
A.) Determining the dynamic route B.) Defining the subnet C.) Defining the
Administrative Distance D.) Determining the next hop

Ans D

915. Which layer hides details of network dependent information from the higher
layers by providing transparent data transfer?
A.) Transport B.)
Physical C.) Data Link
D.) Session E.)
Application F.)
Network

Ans

916 What information is provided by the local management interface (LMI)?

A.) LMI encapsulation type B.) The current DLCI values C.) The status of virtual circuits
D.) The global or local significance of the DLCI values

Ans A B C

917 Which layer defines the physical topology?

A.) Application B.)
Transport C.) Network
D.) Data Link E.)
Physical F.) Session

Ans E

918 What key do you use to view the last command?

A.) Left Arrow B.) Ctrl-P C.) Up Arrow D.) Right Arrow

Ans B C

919. Which of the following do not belong to the customer?
A.) CO B.) DCE C.) Router D.) CPE E.) Demarc F.) DTE

Ans A E

920 What is the IEEE specification for Spanning Tree Protocol?

A.) 802.9 B.)
803.ud C.) 803 D.)
802.1d

Ans D

921. CO is an acronym for which of the following?
A.) Central Office B.)
Capital Office C.) Central
Operator D.) Company
Office

Ans A

922 What is convergence time?

A.) The update time B.) The time it takes to reload a router C.) The time it takes for a
packet to reach its destination D.) The time is takes for all routers update their tables after
a change takes place

Ans D

923. Which of the following are Session Layer standards?
A.) ASCII and EBCDIC B.) MPEG and MIDI C.) RPC and SQL D.) JPEG and PICT

Ans C

924 What is the IP extended access list range?

A.) 1000-1099 B.) 100-199 C.) 1-99 D.) 101-200

Ans B

925 Define Poison Reverse?

A.) To prevent regular update messages from reinstating a route that has gone down B.)
Packets sent out that are not destined for a network go to the default network C.)
Information received on an interface cannot be sent back out the same interface D.) When a
network goes down, that network is advertised with an infinite metric

Ans D

926. What is the default interval for SAP updates?
A.) 60 seconds B.) 15
seconds C.) 30
seconds D.) 120
seconds

Ans A

927. What does a router do with a packet that it does not have a destination
network for?
A.) Sends it to the Serial port B.) Drops the packet C.) Sends it back out the same
interface it received it in D.) Forwards the packet to the next hop

Ans B

928 What type of frame does CDP use to gather information about it's neighbors?

A.) TCP/IP B.) Novell-ether C.) Subnetwork Access Protocol (SNAP) D.) Ethernet_II

Ans C

929 Which protocol is used for booting diskless workstations?

A.) IP B.) ARP C.) RARP D.) TCP E.) SNMP

Ans C

930. Which layer is responsible for synchronizing sending and receiving

applications?

A.) Presentation B.) Session C.) Transport D.) Application E.) Network

Ans B

931 Which protocol gets a hardware address from a known IP address?

A.) RARP B.) TCP C.) IP D.) BootP E.) ARP F.) ICMP Ans E

932. Which layer defines bit synchronization?
A.) Application B.) Network C.) Transport D.) Physical E.) Session F.) Session

Ans D

933. Which is true regarding half duplex Ethernet operation?
A.) Half Duplex ethernet technology provides a transmit circuit connection wired directly
to the receiver circuit at the other end B.) Half duplex transmission between stations is
achieved by using point to multipoint Ethernet and Fast Ethernet C.) With Half Duplex
transmission logically circuits feed into a single cable creating a situation similar to a one
way bridge D.) Half Duplex transmission between stations is achieved using Point to
Point Ethernet & Fast Ethernet

Ans C

934 When would you use ISDN?

A.) To connect LANs using POTS B.) To support applications requiring voice, data, and
video C.) When you need a consistent and very high rate of data speed D.) To connect
to IBM mainframes

Ans B

935. Which protocol will send a message to routers if a network outage or
congestion occurs?
A.) ARP B.)
TCP C.) IP D.)
ICMP

Ans D

936 What are the 2 functions of the Data Link Mac layer?

A.) Handles access to shared media B.) Manages protocol access to the physical network
medium C.) Provides SAPs for higher level protocols D.) Allows multiple devices to
uniquely identify one another on the data link layer

Ans A B D

937. Which layer is responsible for coordinating communication between
systems?
A.) Application B.) Network C.) Session D.) Transport E.) Physical F.) Data Link

Ans C

938. What is the default CDP broadcast update rate for Cisco routers?
A.) 120 seconds B.) 60
seconds C.) 30 seconds
D.) 90 seconds

Ans B

939. You need to come up with a TCP/IP addressing scheme for your company.
Howmany network IDs must you allow for when you define the subnet mask for the
network?
A.) One for each WAN link B.) One for each router interface C.) One for each NIC
installed in each client D.) One for each subnet with hosts E.) One for each host ID

Ans A D

940. What is the protocol number for UDP?
A.) 6 B.) 17
C.) 25 D.) 21

Ans B

941 What is the default LMI type?

A.) Cisco B.)
ANSI C.) IETF D.)
Q933a

Ans A

942. You have two Cisco routers setup back-to-back in a lab using DTE/DCE
cables. To which router would you add the clockrate command?
A.) The serial port on the DCE router B.) The
Ethernet port on the DTE router C.) The
Ethernet port on the DCE router D.) The serial
port on the DTE router

Ans A

943 How does a switch use store and forward?

A.) By using a Class I repeater in a collision domain B.) The LAN switch copies the
entire frame into its onboard buffers and then looks up the destination address in its
forwarding, or switching, table and determines the outgoing interface C.) By using
broadcast addresses as source addresses D.) The switch waits only for the header to be
received before it checks the destination address and starts forwarding the packets

Ans D

944. Which of the following are valid WAN terms?
A.) DTE B.) DCE
C.) Demarc D.)
CPE

Ans ABCD

945. Which two describe frame tagging?
A.) Examines particular info about each frame B.) A unique ID placed in the header of
each frame as it traverses the switch fabric C.) A user- assigned ID defined to each frame
D.) The building of filter tables

Ans B C

946. An ISDN BRI circuit can be described as which of the following?
A.) 3B channels B.) 2-64Kbps B channels and 1-16Kbps D channel C.) none of the above
D.) 2-64Kbps B channels and 1-16Kbps C channel

Ans B

947 The two sublayers of the IEEE Data Link Layer are which of the following?

A.) Link and Logical Control B.) Data Link and LLC C.) Logical Link Control and Media
Access Control D.) Data Link and MAC

Ans C

948. The -- terminal no editing -- command will perform what function?
A.) Edit the contents of NVRAM B.) Allows access to the terminal port C.) Stops the

advanced editing feature D.) Enable password functions

Ans C

949. Which two of the following are valid ways to have multiple encapsulation
types on a single interface?
A.) This is not possible B.) subinterfaces C.) additional physical interfaces D.)
secondary addresses

Ans B D

950. Which 3 statements describe default encapsulation and LMI type
configuration?
A.) There are only 4 encapsulations and 3 LMI type options B.) The LMI type config
term options C.) In release 11.2 the LMI type is autosensed D.) The default LMI is
Cisco E.) IETF encapsulation must be configured unless the connecting routers are both
Cisco

Ans B C E

951. Which can be true regarding VLANs?
A.) They are created by location B.) They
are created by function C.) They are
created by department D.) They are
created by group

Ans B C D

952. What is true when using DDR?
A.) HDLC is the preferred encapsulation B.) You must use static routing C.) You
should use dynamic routing D.) You should use ISDN

Ans B

953. If you are running Token Ring with Novell IPX routing, which encapsulation
should you use?
A.) SAP B.)
SNAP C.) 802.5
D.) 802.2

Ans B

954 What are the 3 ways routers learn paths to destination networks?

A.) Dynamic B.) Static C.) Routing tables D.) Default

Ans A B D

955. Bridges work at what layer of the OSI model?
A.) Data Link B.)
Network C.) Physical
D.) Application

Ans A

956 What is the default switching method for the Cisco 5000 series?

A.) Cut-through B.) Store-and-splice C.) Latency D.) Store-and-forward

Ans D

957. The benefits to segmenting with Bridges are which of the following?
A.) Scalability B.) Datagram filtering C.) Manageability D.) Reliability

Ans B C

958. What is the administrative distance for IGRP?
A.) 90 B.) 120
C.) 110 D.)
100

Ans D

959. On an ISDN BRI interface, the control channel is the 'D' channel. What is the
rate of this channel?
A.) 64 Kbps B.) 1.544
Mbps C.) 128 Kbps D.)

2.048 Mbps E.) 16
Kbps
Ans E

960 MIDI and MPEG are examples of what layer of the OSI seven layer model?

A.) Session B.) Network C.) Datalink D.) Transport E.) Application F.) Presentation

Ans F

961 Which ISDN specification series deals with Concepts and Terminology?

A.) C- Series B.) I-
Series C.) Q-Series
D.) 911-Series E.)
J-Series F.) F-Series

AnsB

962. Which of the following is an example of the Physical Layer?
A.) SQL B.) IP C.) LLC D.) DDP E.) Ethernet

Ans E

963 In regards to the ISDN BRI standard, which channel is used for control?

A.) B B.) D
C.) E D.) I
E.) Q

Ans B

1 964. Which protocol resolves an IP address to a MAC address? A.) DHCP B.)
RARP C.) ARP D.) NBP E.) DNS
2 965. Which of the following is an example of the Network Layer?

Ans C A.) TCP B.) IP C.) SQL D.) Token Ring E.) LLC

Ans B

966 The Internet Control Message Protocol occurs at what layer of the seven
layer model?

A.) Physical B.) Transport C.) Session D.) Datalink E.) Presentation F.) Network

Ans F

967. Which of the following are examples of the Session Layer?
A.) IP B.) Netbios Names C.) NFS D.) Token Ring E.) SQL F.) RPC

Ans B C E F

968 What is the regional Telco office called, where the customers local loop
terminates?

A.) Demarc B.) DTE C.) DCE D.) CO E.) CPE

Ans A

969. What is the default LMI type for Cisco Routers that are using Frame-Relay?
A.) Annex D B.)
Q933A C.) Cisco
D.) IETF E.)
ARPA F.) Anex
A

Ans C

970. Most routing protocols recognize that it is never useful to send
information about a route back out the direction from which the original
packet came. This is an example of which routing technology?
A.) Split Horizon B.) LMI C.) Triggered Updates D.) Poison Reverse E.) SYN, ACK F.)
DLCI

Ans A

971. Which layer of the 7 layer model is responsible for representing the
application information between 2 different OS's? For example, converting
ASCII to EBCIDIC.
A.) Transport B.) Application C.) Physical D.) Session E.) Presentation F.) Network

Ans E

972. Which type of switching reads in the entire frame before forwarding it?
A.) Pause-and -forward B.) Store-and-Forward C.) Inverse ARP D.) Fast Forward E.)
Cut-Through F.) Routing

Ans B

973. Which OSI Reference Layer is concerned with path determination?
A.) Datalink B.)
Physical C.)
Network D.)
Transport E.)
Session

Ans C

974. Which of the following are examples of the Datalink Layer?
A.) LLC B.) SQL C.) TCP D.) Token Ring E.) IP

Ans A D

975 What is the standard ISDN term for a non-native analog telephone?

A.) TE1 B.) TA
C.) LE D.) TE2
E.) ET

Ans D

976. Which Distance Vector characteristic can help to speed up convergence?

A.) Triggered Updates. B.) Split Horizon. C.) Poison Reverse. D.) Hold Down timers.
E.) Inverse ARP.

Ans A

977. Which type of switching is considered to be 'wire speed?'
A.) Cut-Through B.) Multiplexed C.) Inverted D.) Layer 4 E.) Store and Forward F.) Layer

978. The Datalink layer works with which of the following:
A.) Packets B.) Bits C.) Globules D.) Frames E.) Segments Ans D

979. What is a characteristic of Store and Forward switches?
A.) They forward the frame before it is completely read. B.) They work at wire speed. C.)
They are the same a Cut-Through switching. D.) They read the entire frame and check
CRC before forwarding. E.) They decrease latency.

Ans D

980. Station A is transmitting data to station B, and expects an acknowledgment
after every 400 bytes. After transmitting data for a while, the two stations determine
the line is reliable and change to expecting and acknowledgement every 600 bytes.
This is an example of (pick the best answer only):
A.) BECN B.) Sliding Windows C.) Poison Reverse D.) Countdown timers E.) Split
Horizon F.) Count to infinity

Ans B

981. Which device listed below provides clocking for the line?
A.) DCE B.) CPE C.) CO D.) DTE E.) Demarc

Ans C

982 Which OSI Reference Layer controls application to application
communication?

A.) Datalink B.)
Network C.)

Transport D.)
Session E.)
Physical

Ans D

983. The Datalink Layer is broken down into 2 layers, LLC and MAC. The LLC
establishes media independence and what else?
A.) Provides Windowing. B.) Provides flow control. C.) Provides SAP's (Service Access
Points). D.) The Datalink layer does not have sublayers. E.) Provides SAP's (Service
Advertising Protocol). F.) RIP Updates.

Ans B C

984 When a Distance Vector routing protocol detects that a connected network has
gone down, it sends out a special routing update packet, telling all directly connected
routers that the distance to the dead network is infinity. This is an example of which
routing technology?

A.) ICMP. B.) Only Link State routing protocols have this intelligence. C.) Triggered
updates. D.) Garrison-4. E.) Split Horizon. F.) Poison Reverse.

Ans F

985 Which of the following would not be displayed by the command ‘sho cdp
neighbor detail’?

A.) The incoming/outgoing interface.B.) The hardware platform. C.) One address per
protocol. D.) Amount of Flash Memory Available E.) The routers hostname. F.) The
subnet mask, if IP is configured.

Ans D F

986. 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 C D E F

987 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

988. 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

989. 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

990 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

991 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

992. 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

993. 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

994. 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 E

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

A.) ET B.) LE
C.) TE2 D.)
TE3 E.) TA

Ans E

996 Which of the following are Transport layer protocols?

A.) UDP B.)
TCP C.) NBP D.)
IP E.) SPX

Ans A B E

997. 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

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

A.) TCP B.) RPC C.) SQL D.) NFS E.) Token Ring

Ans B C D

999. 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

1000 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

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