CCNA基础知识题(英文版）

来源：vlan9.com 作者：出处：巧巧读书 2007-12-12 进入讨论组

801. What does a Standard IP Access-list use as test criteria?
A.) IP source address B.) IP source and destination address, protocol numbers and port
numbers C.) IPX source and destination address D.) Source MAC address

Ans A

802. What is the function of the Transport layer and which protocols reside
there?
A.) MAC addressing - IP B.) Interhost communication - SQL, NFS C.) Best effort Packet
delivery - TCP, UDP D.) End-to-end connections - TCP, UDP

Ans D

803. Identify the 3 Internet layer IP protocols?
A.) NetBios B.) IPX C.) ARP D.) IP E.) RARP

Ans C D E

804. IPX routing updates occur how often?
A.) Every 30 seconds B.) Every 60 seconds C.) Only as needed D.) When the remote router
asks for an update

Ans B

805. Identify 3 methods not used to prevent routing loops?
A.) Holddown timers B.) Sequence numbers C.) Triggered updates D.) Split horizon
E.) Area hierarchies F.) Order of router startup

Ans B E F

806. Identify the hardware component that stores the bootstrap program?
A.) ROM B.) NVRAM C.) Booter load D.) RAM E.) Flash

Ans A

807. Which OSI layer provides mechanical, electrical & procedural
specifications for activating, maintaining physical link?

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

Ans D

808 Identify 2 characteristics of PPP?

A.) Uses LLC to establish the link B.) Default serial encapsulation C.) Support multiple
layer 3 protocols D.) Offers two types of authentication; PAP and CHAP Ans C D

809. Identify 3 characteristics of a connection oriented protocol?
A.) Path determination B.) Flow control C.) Acknowledgements D.) Uses hop count as
metric E.) 3 way handshake

Ans B D E

810 What is the maximum hop count for IP RIP?

A.) Infinity B.) 16 C.) 15 D.) 1

Ans C

811 What is Cisco's default encapsulation method on serial interfaces?

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

Ans D

812. Which of the following is a characteristic of a switch, but not of a
router?
A.) Switches forward packets based on the IPX or IP address in the frame B.) Switches
forward packets based on the IP address in the frame C.) Switches forward packets based
on the MAC address in the frame D.) Switches forward packets based only on the IP
address in the packet

Ans C

813. Ping uses which Internet layer protocol?
A.) RARP B.)
ICMP C.) ARP D.)
FTP

Ans B

814. Which is true regarding store-and-forward switching method?
A.) Latency varies depending on frame-length B.) Latency is constant C.) It is default for
all Cisco switches D.) It only reads the destination hardware address before forwarding the
frame

Ans A

815. Which three of the following are true statements about connection-oriented
sessions?
A.) The segments delivered are acknowledged back to the sender upon their reception B.)
Any segments not acknowledged are retransmitted by the receiver C.) A manageable data
flow is maintained in order to avoid congestion, overloading and loss of any data D.)
Segments are sequenced back into their proper order upon arrival at their destination

Ans A C D

816 What does a metric of 16 hops represent when using RIP?

A.) Number of hops to the destination B.) Destination unreachable C.) Number of routers
D.) Bandwidth

Ans B

817. You need to come up with a TCP/IP addressing scheme for your company.
Which two factors must you consider when you define the subnet mask for the
network?
A.) The location of DHCP servers B.) The volume of traffic on each subnet C.) The
number of subnets on the network D.) The location of the default gateway E.) The number
of host IDs on each subnet

Ans C E

818. What is the difference between TCP and UDP?
A.) TCP is connection-oriented; UDP uses acknowledgements only B.) TCP is
connection-oriented; UDP is connectionless C.) Both TCP and UDP are
connection-oriented, but only TCP uses windowing D.) TCP and UDP both have
sequencing, but UDP is connectionless

Ans B D

819. What does the 'S' mean when looking at the routing table?
A.) Statically connected B.)
Directly connected C.)
Dynamically attached D.)
Shutdown route

Ans A

820. Why would you use static routing instead of dynamic routing?
A.) When you want automatic updates of the routing tables B.) All the time C.) When
you have very few routes and want to conserve bandwidth D.) When you have a gateway
of last resort

Ans C

821. What does the acronym ARP stand for?
A.) Address Resolution Phase B.) ARP
Resolution Protocol C.) Address
Resolution Protocol D.) Address Recall
Protocol

Ans C

822. What is the default encapsulation of Netware 3.12?
A.) Ethernet_II B.) 802.5 C.) 802.2 D.) 802.3

Ans C

823. Regarding frame relay, which of the following statements are true?
A.) You must use ANSI encapsulation if connecting to non-Cisco equipment B.)
You must use IETF encapsulation if connecing to non-Cisco equipment C.) You
must use Q.933a encapsulation if connecing to non-Cisco equipment D.) You must
use Cisco encapsulation if connecting to non-Cisco equipment

Ans B

824 What is required to support full-duplex Ethernet?

A.) Multiple paths between multiple stations on a link B.) Automatic sensing operation by
all connected stations C.) Loopback and collision detection disabled D.) Full-duplex NIC
cards

Ans C D

825. Which layer is responsible for determining if sufficient resources for the
intended communication exists?
A.) Application B.) Network C.) Session D.) Presentation E.) Transport

Ans A

826. 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

827. Describe End to End network services: (Choose all that apply)
A.) Best Route selection B.) Accomplished Segment by Segment, each segment is
autonomous C.) Flow Control & Data Integrity D.) Best efforts packet delivery

Ans B C

828. Which of the following provide correct information about a protocol at the
transport layer of the OSI model?
A.) UDP - Provides Connectionless datagrams service B.) TCP - Provides Connection
Oriented Services C.) SMTP - Provides Mail Exchange D.) IP - Route determination E.)
TCP - Provides Flow Control and Error Checking F.) FTP - Transfers of Files

Ans A E

829. Which protocol works at the Internet layer and is responsible for making
routing decisions?
A.) UDP B.) IP
C.) TCP D.)
ARP

Ans B

830. Which layer is responsible for providing mechanisms for multiplexing
upper-layer application, session establishment, and tear down of virtual
circuits?
A.) Session B.) Network C.) Physical D.) Transport E.) Application F.) Presentation

Ans D

831. Which of the following are logged when IP access list logging is enabled?
A.) source address B.) protocol C.) source port D.) destination address E.) access list
number F.) destination port

Ans A B C D F

832. What's the default CDP holdtime in seconds for Cisco routers?

A.) 30 seconds B.) 180
seconds C.) 90 seconds
D.) 60 seconds

Ans B

833. Which two of the following protocols are used at the Transport layer?
A.) ARP B.) UDP C.) ICMP D.) RARP E.) TCP F.) BootP

Ans B E

834. LAN stands for which of the following?
A.) Local Area Network B.) Local Arena Network C.) Local Area News D.) Logical Area
Network

Ans A

835. Choose three reasons why the networking industry uses a layered model:
A.) It facilitates systematic troubleshooting B.) It allows changes in one layer to occur
without changing other layers C.) It allows changes to occur in all layers when changing
one protocol D.) It clarifies how to do it rather than what general function to be done E.)
It clarifies what general function is to be done rather than how to do it

Ans A B D

836 A ISDN PRI circuit can be described as which of the following?

A.) 24 B channels and 1-64Kbps D channel B.) 23 B channels and 1-64Kbps D channel C.)
2-D channels and 1-C channel D.) 2-64Kbps B channels and 1-16Kbps D channel

Ans B

837. What are 3 ways to provide login access to router?
A.) Console B.) TFTP C.) Rlogin D.) Auxiliary Port E.) X Windows F.) Telnet

Ans A D F

838 Which of the following statements are true?

A.) Store and forward switching creates variable latency through the switch B.) Cut
through switching creates variables latency through the switch C.) Cut through switching
works at wire speed D.) Store and forward switching works at wire speed

Ans A C

839 Which of the following can reply to a Novell Get Nearest Server (GNS)
request?

A.) Local Novell server B.) Remote Novell Printer C.) Cisco router D.) Novell client

Ans A C

840. Identify the 3 kinds of routes IGRP advertises?
A.) Interior B.)
Dynamic C.)
System D.) Exterior

Ans A C D

841. What is the routing metric used by RIP?
A.) Route poisoning B.) Split horizon C.) Hop Count D.) TTL

Ans C

842. What is the default encapsulation and frame type on an Ethernet interface
when enabling Novell?
A.) SNAP B.) Ethernet_II C.) 802.2 D.) 802.3 E.) SAP F.) Novell-ether

Ans D F

843. What is true when creating static route?
A.) The mask parameter is optional B.) The administrative distance is required C.) The
gateway parameter is required D.) The administrative distance is optional

Ans C D

844 Of the following switching types, which one has the highest latency?

A.) Cut-through B.) None C.) Store-and-forward D.) Fragment Free

Ans C

845. What does the IPX maximum-path command do?
A.) Allows you to disable the TTL on an IPX packet B.) This parameter is only used in
NLSP routing C.) Sets the maximum metric that can appear in the routing table D.)
Configures round robin load sharing over multiple equal metric paths (parallel paths)

Ans D

846. What does -1 mean in an extended IPX access-list?
A.) Any IP address B.) Deny all C.) Deny host D.) Any host or any network

Ans D

847 What parameter is used with statically assigned routers to tell packets

which interface to use to reach a distant network?

A.) Mask B.) Subnet C.) Default gateway D.) Interface

Ans C

848. Which of the following protocols are used to get an IP address from a
known MAC address?
A.) BootP B.)
TCP C.) IP D.)
ARP E.) RARP
F.) ICMP

Ans A E

849. What does the Spanning Tree Algorithm (STA) do?
A.) Restore lost frames B.) Builds routing tables for routing through an internetwork C.)
Forward packets through a switch D.) STA is implemented by STP to prevent loops

Ans D

850. IP extended access lists use which of the following as a basis for
permitting or denying packets?
A.) destination address B.) all of the above C.) protocol D.) source address E.) port

Ans B

851. What is the extended IPX access list range?
A.) 901-1000 B.)
100-199 C.) 900-999
D.) 1000-1000

Ans C

852. CPE is an acronym for which of the following?
A.) Customer Premise Equipment B.)
Central Processing Engineering C.)
Customer Process Equipment D.) Central
Processing Equipment

Ans A

853. How often does IP RIP send out routing table updates by default?
A.) They send complete updates every 30 seconds B.)
They send partial updates every 30 seconds C.) They
send complete updates every 60 seconds D.) They send
partial updates every 60 seconds Ans A

854 Which ISDN protocol prefix specifies switching and signalling?

A.) I B.) E C.)

Q D.) S

Ans Q

855. CSMA/CD stand for which of the following?
A.) Carrier Sense, Multiple Access with Collision Detection B.)
Collision Sense, Multiple Access with Collision Detection C.)
Collision Sense, Multiple Access with Carrier Detection D.) Carrier
Sense, MAC address with Collision Detection

Ans B

856. Which of the following are Distance Vector protocols?
A.) IGRP B.) RIP
C.) OSFP D.)
EIGRP

Ans A B

857. UDP works at which layer of the DOD model?
A.) Internet B.) Host-to-Host C.) Transport D.) Data Link

Ans B

858. Of the following switching types, which one has the lowest latency?
A.) Cut-through B.) Fragment Free C.) None D.) Store-and-forward

Ans A

859. What is an administrative distance of 0 mean?
A.) 0 means unbelievable B.) 0
is for EIGRP C.) 0 is the default
distance for directly connected
networks D.) 0 means
unreachable

Ans C

860. Which of the following describe full-duplex transmission?
A.) Uses a single wire B.) Data transmission in both directions, but only one way at a time
C.) Uses a point-to-point connection from the transmitter of the transmitting station to the
receiver of the receiving station D.) Data transmission in only one direction

Ans C

860 Which of the following is a connectionless protocol at the Transport layer?

A.) UDP B.) ARP C.) ICMP D.) RARP E.) IP F.) FTP

Ans A

870. What is the default routing metric used by IGRP?
A.) MTU, delay, bandwidth, reliability, and loading B.) Count to infinity C.) Bandwidth
and delay D.) Hop count

Ans C (MTU, reliability, and loading are optional)

871 What does 'P' mean when running a Trace?

A.) Good route B.) Protocol unreachable C.) Source Quench D.) Destination unreachable

Ans B

872. What is the Network Layer of the OSI responsible for?
A.) Bridging B.) Routing packets through an internetwork C.) Regenerating the digital
signal D.) Gateway services

Ans B

873 Which layer is responsible for routing through an internetwork?

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

Ans C

874. What three occurrences will reset the holddown timer after a triggered
update?
A.) Infinity is finally defined as some max number B.) HD Timer expires C.) Another
update is received indicating a better metric D.) The router receives a processing task
proportional to the number of links in the internetwork E.) The router detects fault
LSP's propagating through the internetwork F.) Another update is received indicating net
status changed

Ans A B C

875. Which layer is responsible for putting 1s and 0s into a logical group?
A.) Session B.)
Application C.)
Transport D.) Data

Link E.) Physical F.)
Network

Ans E

876. How many LMI types are available on Cisco routers?
A.) Four B.) Two
C.) Five D.)
Three

Ans D

877. Which layer is responsible for framing?
A.) Application B.)
Data Link C.) Physical
D.) Network E.)
Transport

Ans B

878. What ISDN protocol specifies concepts, terminology, and services?
A.) Q B.) S
C.) I D.) E

Ans C

879. What is the purpose of Split Horizon?
A.) It prevents the regular update messages from reinstating a route that has gone down B.)
Information received on an interface cannot be sent back out the same interface C.) Informs
all neighbor routers that two routes exist D.) Tells the router the destination is
unreachable

Ans B

880. WAN stands for which of the following?
A.) Wide Arena Network B.) World Area Network C.) Wide Area News D.) Wide
Area Network

Ans D

881. Which of the following provide connection-oriented transport to upper layer
protocols?
A.) SPX B.) RIP
C.) NLSP D.)
NCP

Ans A

882. Which two does 100BaseT use?
A.) CSMA/CD B.) IEEE 802.5 C.) 802.3u D.) Switching with 53-byte cells

Ans A

883. Which layer is responsible for flow control, acknowledgement, and
windowing?
A.) Transport B.) Network C.) Application D.) Session E.) Physical F.) Data Link

Ans A

884. Which of the following is used to manage and monitor the network?
A.) SNMP B.) HTTP C.) IP D.) FTP

Ans A

885 What is true about Link-State protocols?

A.) They maintain a more complex table than distant vector protocols B.) They maintain a
less complex table than distant vector protocols C.) They use routing ports D.) The
maintain backup copies of the IOS

Ans A

886. The maximum distance on a 10BaseT network from the hub to a workstation is
which of the following?
A.) 500 meters B.)
1000 meters C.) 100
meters D.) 1500
meters

Ans C

887 Which of the following use PVCs at layer 2?

A.) X.25 B.) HDLC C.) Frame relay D.) ISDN

Ans C

888. What is the routing algorithm used by RIP and IGRP?
A.) OSPF B.) Link-state C.) Dynamic D.) Distance Vector

Ans D

889. Which layer is responsible for negotiating data transfer syntax?
A.) Network B.) Session C.) Application D.) Transport E.) Presentation

Ans E

890 What are hold-downs used for?

A.) To prevent regular update messages from reinstating a route that has come back up
B.) Information received on an interface cannot be sent back out the same interface C.) To
prevent regular update messages from reinstating a route that has gone down D.) To hold
the routing table from being sent to another router

Ans C

891 Which of the following protocols are used for logical network addressing?

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

Ans A

892 Which can be logged by IPX extended access lists?

A.) source address B.) protocol C.) source socket D.) access list number E.) destination
socket F.) destination address

Ans A B S D E F

893. Put the following steps of encapsulation into the correct order:
1) The data is broken into segments to be organized 2) Frames are converted to 1s and 0s
to be put on the wire 3) Packets are converted into frames 4) Information that users
enter is converted into data 5) The segments are changed to packets to be routed A.) 4, 1,
3, 2, 5 B.) 4, 5, 1, 3, 2 C.) 2, 3, 1, 4, 5 D.) 4, 1, 5, 3, 2

Ans D

894 Which port numbers are used by TCP and UDP to set up sessions with other
hosts?

A.) 1024 and above B.) 6 and 17 respectively C.) 1-25 D.) 6-17

Ans A

895 Repeaters work at which layer of the OSI model?

A.) Network B.)
Session C.)
Transport D.)
Physical

Ans D

896. What protocols can you use while testing Trace?

A.) DECnet B.)
CLNS C.) IP D.)
Old Vines E.)
Vines F.) Chaos

Ans B C D E

897. What utility can you use to see the path a packet takes through an
internetwork?
A.) Route B.)
SNMP C.) Trace
D.) Ping

Ans C

898 What is true about frame-relay DLCI?

A.) DLCI represents a single physical circuit B.) DLCI is optional in all frame-relay
networks C.) DLCI identifies a logical connection between DTE devices D.) DLCI is
used to tag the beginning of a frame with VLAN information

Ans C

899 Which frame has a Type field to identify the upper-layer protocol?

A.) 802.3 B.) 802.2 C.) 802.5 D.) Ethernet_II

Ans A

900. Which protocol will let neighbor routers know if your internetwork
experienced congestion on a serial port?
A.) BootP B.) IP C.) ICMP D.) ARP E.) FTP F.) RARP

Ans C