CNA第一学期Finaleam考试英文答案RSC

1 A medium-sized business is researching available options for connecting to the Internet. The

company is looking for a high speed option with dedicated, symmetric access. Which

connection type should the company choose?

DSL

dialup

satellite

leased line

cable modem

2 What is the purpose of having a converged network?

to provide high speed connectivity to all end devices

to make sure that all types of data packets will be treated equally

to achieve fault tolerance and high availability of data network infrastructure devices

to reduce the cost of deploying and maintaining the communication infrastructure

3 What characteristic of a network enables it to quickly grow to support new users and

applications without impacting the performance of the service being delivered to existing users?

reliability

scalability

quality of service

accessibility

4 Which connection provides a secure CLI session with encryption to a Cisco switch?

a console connection

an AUX connection

a Telnet connection

an SSH connection

5 A network technician is attempting to configure an interface by entering the following

command: SanJose(config)# ip address 192.168.2.1 255.255.255.0. The command is

rejected by the device. What is the reason for this?

The command is being entered from the wrong mode of operation.

The command syntax is wrong.

The subnet mask information is incorrect.

The interface is shutdown and must be enabled before the switch will accept the IP address.

6 After several configuration changes are made to a router, the copy running-configuration

startup-configuration command is issued. Where will the changes be stored?

flash

ROM

NVRAM

RAM

the configuration register

a TFTP server

7

Refer to the exhibit. From global configuration mode, an administrator is attempting to create a message-of-the-day banner by using the

command banner motd V Authorized access only! Violators will be prosecuted! V When users log in using Telnet, the banner does not appear correctly. What is the problem?

The banner message is too long.

The delimiting character appears in the banner message.

The symbol “!” signals the end of a banner message.

Message-of-the-day banners will only appear when a user logs in through the console port.

8 What are three characteristics of an SVI? (Choose three.)

It is designed as a security protocol to protect switch ports.

It is not associated with any physical interface on a switch.

It is a special interface that allows connectivity by different types of media.

It is required to allow connectivity by any device at any location.

It provides a means to remotely manage a switch.

It is associated with VLAN1 by default.

9 A technician configures a switch with these commands:

SwitchA(config)# interface vlan 1

SwitchA(config-if)# ip address 192.168.1.1 255.255.255.0

SwitchA(config-if)# no shutdown

What is the technician configuring?

Telnet access

SVI

password encryption

physical switchport access

10 In computer communication, what is the purpose of message encoding?

to convert information to the appropriate form for transmission

to interpret information

to break large messages into smaller frames

to negotiate correct timing for successful communication

11 What protocol is responsible for controlling the size of segments and the rate at which

segments are exchanged between a web client and a web server?

TCP

IP

HTTP

Ethernet

12 What are two benefits of using a layered network model? (Choose two.)

It assists in protocol design.

It speeds up packet delivery.

It prevents designers from creating their own model.

It prevents technology in one layer from affecting other layers.

It ensures a device at one layer can function at the next higher layer.

13 What is the process of dividing a data stream into smaller pieces before transmission?

segmentation

encapsulation

encoding

flow control

14 When IPv4 addressing is manually configured on a web server, which property of the IPv4

configuration identifies the network and host portion for an IPv4 address?

DNS server address

subnet mask

default gateway

DHCP server address

15 A network administrator is troubleshooting connectivity issues on a server. Using a tester, the

administrator notices that the signals generated by the server NIC are distorted and not usable. In which layer of the OSI model is the error categorized?

presentation layer

network layer

physical layer

data link layer

16 A network engineer is measuring the transfer of bits across the company backbone for a

mission critical database application. The engineer notices that the network throughput

appears lower than the bandwidth expected. Which three factors could influence the

differences in throughput? (Choose three.)

the amount of traffic that is currently crossing the network

the sophistication of the encapsulation method applied to the data

the type of traffic that is crossing the network

the latency that is created by the number of network devices that the data is crossing

the bandwidth of the WAN connection to the Internet

the reliability of the gigabit Ethernet infrastructure of the backbone

17 Which type of UTP cable is used to connect a PC to a switch port?

console

rollover

crossover

straight-through

18 What is a characteristic of the LLC sublayer?

It provides the logical addressing required that identifies the device.

It provides delimitation of data according to the physical signaling requirements of the medium.

It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.

It defines software processes that provide services to the physical layer.

19 What are the three primary functions provided by Layer 2 data encapsulation? (Choose

three.)

error correction through a collision detection method

session control using port numbers

data link layer addressing

placement and removal of frames from the media

detection of errors through CRC calculations

delimiting groups of bits into frames

conversion of bits into data signals

20 What will a host on an Ethernet network do if it receives a frame with a destination MAC

address that does not match its own MAC address?

It will discard the frame.

It will forward the frame to the next host.

It will remove the frame from the media.

It will strip off the data-link frame to check the destination IP address.

21 What are two actions performed by a Cisco switch? (Choose two.)

building a routing table that is based on the first IP address in the frame header

using the source MAC addresses of frames to build and maintain a MAC address table

forwarding frames with unknown destination IP addresses to the default gateway

utilizing the MAC address table to forward frames via the destination MAC address

examining the destination MAC address to add new entries to the MAC address table

22 What are two examples of the cut-through switching method? (Choose two.)

store-and-forward switching

fast-forward switching

CRC switching

fragment-free switching

QOS switching

23

Refer to the exhibit.

If host A sends an IP packet to host B, what will the destination address be in the frame when it leaves host A?

DD:DD:DD:DD:DD:DD

172.168.10.99

CC:CC:CC:CC:CC:CC

172.168.10.65

BB:BB:BB:BB:BB:BB

AA:AA:AA:AA:AA:AA

24 What are two services provided by the OSI network layer? (Choose two.)

performing error detection

routing packets toward the destination

encapsulating PDUs from the transport layer

placement of frames on the media

collision detection

25 What information is added during encapsulation at OSI Layer 3?

source and destination MAC

source and destination application protocol

source and destination port number

source and destination IP address

26 What are two functions of NVRAM? (Choose two.)

to store the routing table

to retain contents when power is removed

to store the startup configuration file

to contain the running configuration file

to store the ARP table

27

Refer to the exhibit. The network administrator for a small advertising company has chosen to use the 192.168.5.96/27 network for internal LAN addressing. As shown in the exhibit, a static IP address is assigned to the company web server. However, the web server cannot access the Internet. The administrator verifies that local workstations with IP addresses that are assigned by a DHCP server can access the Internet, and the web server is able to ping local workstations. Which component is incorrectly configured?

subnet mask

DNS address

host IP address

default gateway address

28 Why does a Layer 3 device perform the ANDing process on a destination IP address and

subnet mask?

to identify the broadcast address of the destination network

to identify the host address of the destination host

to identify faulty frames

to identify the network address of the destination network

29 What are the three ranges of IP addresses that are reserved for internal private use? (Choose

three.)

10.0.0.0/8

64.100.0.0/14

127.16.0.0/12

172.16.0.0/12

192.31.7.0/24

192.168.0.0/16

30 Which three addresses are valid public addresses? (Choose three.)

198.133.219.17

192.168.1.245

10.15.250.5

128.107.12.117

192.15.301.240

64.104.78.227

31 What type of IPv6 address is FE80::1?

loopback

link-local

multicast

global unicast

32

Refer to the exhibit. On the basis of the output, which two statements about network connectivity are correct? (Choose two.) There is connectivity between this device and the device at 192.168.100.1.

The connectivity between these two hosts allows for videoconferencing calls.

There are 4 hops between this device and the device at 192.168.100.1.

The average transmission time between the two hosts is 2 milliseconds.

This host does not have a default gateway configured.

33 Which subnet would include the address 192.168.1.96 as a usable host address?

192.168.1.64/26

192.168.1.32/27

192.168.1.32/28

192.168.1.64/29

34 How many hosts are addressable on a network that has a mask of 255.255.255.248?

2

6

8

14

16

254

35 Which statement is true about variable-length subnet masking?

Each subnet is the same size.

The size of each subnet may be different, depending on requirements.

Subnets may only be subnetted one additional time.

Bits are returned, rather than borrowed, to create additional subnets.

36

Refer to the exhibit. Consider the IP address of 192.168.10.0/24 that has been assigned to a high school building. The largest network in this building has 100 devices. If 192.168.10.0 is the network number for the largest network, what would be the network number for the next largest network, which has 40 devices?

192.168.10.0

192.168.10.128

192.168.10.192

192.168.10.224

192.168.10.240

37 In what two situations would UDP be the preferred transport protocol over TCP? (Choose

two.)

when applications need to guarantee that a packet arrives intact, in sequence, and unduplicated

when a faster delivery mechanism is needed

when delivery overhead is not an issue

when applications do not need to guarantee delivery of the data

when destination port numbers are dynamic

38 What important information is added to the TCP/IP transport layer header to ensure

communication and connectivity with a remote network device?

timing and synchronization

destination and source port numbers

destination and source physical addresses

destination and source logical network addresses

39 What is the TCP mechanism used in congestion avoidance?

three-way handshake

socket pair

two-way handshake

sliding window

40 Which three statements characterize UDP? (Choose three.)

UDP provides basic connectionless transport layer functions.

UDP provides connection-oriented, fast transport of data at Layer 3.

UDP relies on application layer protocols for error detection.

UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.

UDP relies on IP for error detection and recovery.

UDP provides sophisticated flow control mechanisms.

41 Which two tasks are functions of the presentation layer? (Choose two.)

compression

addressing

encryption

session control

authentication

42 Which two protocols operate at the highest layer of the TCP/IP protocol stack? (Choose two.)

DNS

Ethernet

IP

POP

TCP

UDP

43 Which two roles can a computer assume in a peer-to-peer network where a file is being

shared between two computers? (Choose two.)

client

master

server

slave

transient

44 What is the function of the HTTP GET message?

to request an HTML page from a web server

to send error information from a web server to a web client

to upload content to a web server from a web client

to retrieve client email from an email server using TCP port 110

45 A wireless host needs to request an IP address. What protocol would be used to process the

request?

FTP

HTTP

DHCP

ICMP

SNMP

46 When planning for network growth, where in the network should packet captures take place to

assess network traffic?

on as many different network segments as possible

only at the edge of the network

between hosts and the default gateway

only on the busiest network segment

47 When applied to a router, which command would help mitigate brute-force password attacks

against the router?

exec-timeout 30

service password-encryption

banner motd $Max failed logins = 5$

login block-for 60 attempts 5 within 60

48

Refer to the exhibit.

An administrator is testing connectivity to a remote device with the IP address 10.1.1.1. What does the output of this command indicate?

Connectivity to the remote device was successful.

A router along the path did not have a route to the destination.

A ping packet is being blocked by a security device along the path.

The connection timed out while waiting for a reply from the remote device.