Bài tập CCNA

8/3/2019 Bài tập CCNA

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1

When connectionless protocols are implemented at the lower layers of the OSI model, what is usually

used to

acknowledge that the data was received and to request the retransmission of missing data?

a. IP

b. UDP

c. Ethernet

d. a connectionless acknowledgement

e. an upper-layer, connection-oriented protocol or service

2

Refer to theexhibit. Each media link is labeled. What type of cable should be used to connect the different

devices?

a. Connection 1 - rollover cable

Connection 2 - straight-through cable

Connection 3 - crossover cable

b. Connection 1 - crossover cable

Connection 2 - rollover cable


c. Connection 1 - straight-through cable



d. Connection 1 - straight-through cable


Connection 3 - straight-through cable

3

Which OSI layer does IP rely on to determine whether packets have been lost and to request

retransmission?

a. application

b. presentation c. session

d. transport

4

What is true regarding network layer addressing? (Choose three.)

a. uses a flat structure

b. prevent broadcasts

c. heirarchical

d. uniquely identifies each host e. 48 bits in length



f. contains a network portion

5

A PC can not connect to any remote websites, ping its default gateway, or ping a printer that isfunctioning properly

on the local network segment. Which action will verify that the TCP/IP stack is functioning correctly on

this PC?

a. Use the ipconfig /all command at the host’s command prompt.

b. Use the ping 127.0.0.1 command at the command prompt.

c. Use the traceroute command at the command prompt to identify any failures on the path to the

gateway.

d. Use FTP to check for connectivity to remote sites.

e. Download a troubleshooting tool from the PC manufacturer's website.

6

Which type of media is immune to EMI and RFI? (Choose two.)

a. 10 Base-T

b. 10 Base-2

c. 10 Base-5

d. 100 Base-FX

e. 100 Base TX

f. 1000 Base LX

7

Refer to the exhibit. The command

that is shown was issued on a PC. What does the IP address 192.168.33.2 represent?

a. IP address of the host

b. default gateway of the host

c. IP address of the homepage for the host

d. primary domain name server for the host

e. IP address of the website resolver1.mooki.local



8

Refer to the

exhibit. The diagram represents the process of sending email between clients. Select the list below

that correctly identifies the component or protocol used at each numbered stage of the diagram.

a. 1.MUA 2.MDA 3.MTA 4.SMTP 5.MTA 6.POP 7.MDA 8.MUA

b. 1.MUA 2.POP 3.MDA 4.SMTP 5.MTA 6.MDA 7.SMTP 8.MUA

c. 1.MUA 2.POP 3.SMTP 4.MDA 5.MTA 6.SMTP 7.POP 8.MUA

d. 1.MDA 2.SMTP 3.MTA 4.SMTP 5.MTA 6.MUA 7.POP 8.MDA

e. 1.MUA 2.SMTP 3.MTA 4.SMTP 5.MTA 6.MDA 7.POP 8.MUA

9

Which three statements characterize the transport layer protocols? (Choose three.)

a. TCP and UDP port numbers are used by application layer protocols.

b. TCP uses port numbers to provide reliable transportation of IP packets.

c. UDP uses windowing and acknowledgments for reliable transfer of data.

d. TCP uses windowing and sequencing to provide reliable transfer of data.

e. TCP is a connection-oriented protocol. UDP is a connectionless protocol.

10

Which OSI layers offers reliable, connection -oriented data communication services?

a. application

b. presentation

c. session d. transport

e. network



11

Examine the

graphic with current configurations. Host A in the Clerical office failed and was replaced. Although

ping to 127.0.0.1 was successful, the replacement computer cannot access the company network.

With proxy ARP disabled on the Fa0/0 interface of the New York router, what is the likely cause of the

problem?

a. network card failure

b. network cables unplugged

c. IP address incorrectly entered

d. subnet mask incorrectly entered

12

Refer to the

exhibit. A network technician is trying to determine the correct IP address configuration for Host What

is a valid configuration for Host A? a. IP address: 192.168.100.19; Subnet Mask: 255.255.255.248; Default Gateway: 192.16.1.2

b. IP address: 192.168.100.20; Subnet Mask: 255.255.255.240; Default Gateway:

192.168.100.17

c. IP address: 192.168.100.21; Subnet Mask: 255.255.255.248; Default Gateway:

192.168.100.18

d. IP address: 192.168.100.22; Subnet Mask: 255.255.255.240; Default Gateway: 10.1.1.5

e. IP address: 192.168.100.30; Subnet Mask: 255.255.255.240; Default Gateway: 192.168.1.1

f. IP address: 192.168.100.31; Subnet Mask: 255.255.255.240; Default Gateway: 192.168.100.18



13

As network administrator, what is the subnet mask that allows 510 hosts given the IP address

172.30.0.0?

a. 255.255.0.0

b. 255.255.248.0

c. 255.255.252.0

d. 255.255.254.0

e. 255.255.255.0

f. 255.255.255.128

14

What are three characteristics of CSMA/CD? (Choose three.)

a. Devices can be configured with a higher transmission priority.

b. A jam signal indicates that the collision has cleared and the media is not busy.

c. A device listens and waits until the media is not busy before transmitting.

d. The device with the electronic token is the only one that can transmit after a collision.

e. All of the devices on a segment see data that passes on the network medium.

f. After detecting a collision, hosts can attempt to resume transmission after a random time delay

has expired.

15

Which of the following are the address ranges of the private IP addresses? (Choose three.)

a. 10.0.0.0 to 10.255.255.255

b. 200.100.50.0 to 200.100.25.255

c. 150.150.0.0 to 150.150.255.255

d. 172.16.0.0 to 172.31.255.255

e. 192.168.0.0 to 192.168.255.255

f. 127.16.0.0 to 127.31.255.255

16

Which combination of network id and subnet mask correctly identifies all IP addresses from

172.16.128.0 through 172.16.159.255?

a. 172.16.128.0 255.255.255.224

b. 172.16.128.0 255.255.0.0

c. 172.16.128.0 255.255.192.0

d. 172.16.128.0 255.255.224.0

e. 172.16.128.0 255.255.255.192



17

Which password is automatically encrypted when it is created?

a. vty

b. aux

c. console

d. enable secret

e. enable password

18

Due to a security violation, the router passwords must be changed. What information can be

learned from the following configuration entries? (Choose two.)

Router(config)# line vty 0 3

Router(config-line)# password c13c0

Router(config-line)# login

a. The entries specify three Telnet lines for remote access.

b. The entries specify four Telnet lines for remote access.

c. The entries set the console and Telnet password to "c13c0".

d. Telnet access will be denied because the Telnet configuration is incomplete.

e. Access will be permitted for Telnet using "c13c0" as the password.

19

When must a router serial interface be configured with the clock rate command?

a. when the interface is functioning as a DTE device

b. when the interface timers have been cleared

c. when the connected DTE device is shut down

d. when the interface is functioning as a DCE device

20

Which two functions of the OSI model occur at layer two? (Choose two.)

a. physical addressing

b. encoding

c. routing

d. cabling

e. media access control

21

A routing issue has occurred in you internetwork. Which of the following type of devices should

be examined to isolate this error?

a. access point

b. host

c. hub

d. router



e. switch

22

Refer to the exhibit. With the router running NAT, what IP addresses can

be applied to the computer to allow access to the Internet? (Choose three.)

a. 192.168.18.38

b. 192.168.18.48

c. 192.168.18.49

d. 192.168.18.52

e. 192.168.18.59

f. 192.168.18.63

23

Refer to the exhibit.

What two facts can be determined from the information that is given? (Choose two.)

a. This exchange is part of the three -way handshake.

b. The source port indicates that a Telnet session has been initiated.

c. The data is flowing from server to client.

d. The destination port indicates that an HTTP session has been initiated.

e. The data listed is associated with the transport layer.

f. The source port does not support communication with the destination port that is listed.



24

Refer to the exhibit. Host A attempts to establish a TCP/IP session with host C. During this attempt, a

frame was captured with the source MAC address 0050.7320.D632 and the destination MAC address

0030.8517.44C4. The packet inside the captured frame has an IP source address 192.168.7.5, and

the destination IP address is 192.168.219.24. At which point in the network was this packet captured?

a. leaving host A

b. leaving ATL

c. leaving Dallas

d. leaving NYC

25

Refer to the exhibit. A

network administrator remotely accesses the CLI of RouterB from PC1 using Telnet. Which statement

is true about this connection?

a. The data is automatically encrypted.

b. A Telnet server process is running on PC1.

c. The connection is made through a VTY session on the router.



d. A GET request was sent to RouterB to retrieve data during this session.

26

You are setting up a VLAN in your company. You only have one VLAN. Do you require VLAN

Trunking Protocol?

a. Yes

b. No

27

What is required for full-duplex Ethernet a. A point-to-point connection between only two nodes

b. A dedicated switch port for each node

c. A full-duplex compatible NIC and switch port

d. All of the above

28

Layer 2 devices such as switches break up broadcast domains a. True

b. False

29

What is the structure of the MAC address?

a. 32 bit network ID + 32 bit host ID

b. 14 bit vendor code + 6 bit serial number

c. 24 bit vendor code + 24 bit serial number

d. Network + Host

30

The NAT terminology "outside local" refers to... a. Name of inside source address before translation

b. Name of destination host before translation

c. Name of inside host after translation

d. Name of outside destination host after translation

31

Protocol Data Units of Layer 4 are called? a. Packets

b. Bits

c. Segments

d. Packets



32

What happens if a packet does not match any of the ACL statements?

a. Nothing

b. It is rejected

c. It is allowed

33

In a network segment only one device can communicate at a time

a. True

b. False

34

PPP can be used with...?

a. Synchronous serial links

b. Asynchronous serial links

c. Both synchronous and asynchronous links

35

According to the EIA/TIA, what is the standard type of connector for Ethernet media?

a. RJ-11

b. RJ-45 c. AUI

d. X.35

e. BNC

36

What is the dotted decimal format of the loop back address?

a. 192.168.0.0

b. 127.0.0.1

c. 192.0.0.1

d. 227.0.0.1

37

What command would you use to erase the startup config of a router?

a. erase nvram

b. erase flash

c. delete startup

d. erase startup



e. delete run

38

What keyword should you use to tell the router not to discard a static route even if it is not

routable?

a. copy run start

b. permanent

c. Router saves every route.

d. auto

e. ip route

39

What protocol range would you use for extended IPX in ACLs?

a. 1-99

b. 100-199

c. 800-899

d. 900-999

40

What does the Spanning Tree Protocol achieve?

a. Determines a loop free topology

b. Sets up a meshed switched topology

c. Creates bridge loops and broadcast storms

d. Disseminates VLAN topology

41

What does R represent in conjunction with ISDN reference points?

a. References points between non-ISDN device and TA

b. References points that connect into NT2 (Inbound)

c. References Outbound connections from NT2 into ISDN network or NT1

d. References connection between NT1 and ISDN network (North America only)

42

What IOS command displays the IP routing table?

a. show route\r\n\r\n

b. show ip route

c. show ip table route

d. show ipx route

43



What command would you use to copy an existing IOS file from a TFTP server to your router?

a. copy flash tftp

b. copy ios tftp

c. install tftp flash

d. copy tftp flash

44

Is Novell IPX RIP compatible with IP RIP?

a. Yes

b. No

45

By default all Cisco routers are...

a. DTE devices

b. DCE devices

46

The purpose of Hold down is to hold a route in the routing table until it comes back up?

a. True

b. False

47

By default is CDP enabled or disabled on compatible devices?

a. Enabled

b. Disabled

48

What is the maximum length of a fiber-optic cable on a 802.3 10Base-FL network?

a. 100 m

b. 300 m

c. 150 m

d. 2000 m

e. 1500 m

49

What IP address will test the internal loopback of a node?

a. 127.0.0.1

b. 255.255.255.255

c. 0.0.0.0



d. 126.0.0.1

e. 127.0.0.0

50

Which protocol is used to determine the IP address if the MAC address is already known? a. ARP

b. RARP

c. IP

d. IPX

e. TCP

51

IP and IPv6 and IPX are examples of... a. Routing protocols

b. Routed protocols

52

What network medium is not susceptible to electromagnetic interference whatsoever?

a. fiber-optic cable

b. copper twisted-pair

c. UTP

53

What does the trace response U mean?

a. Network unreachable

b. Not forwarded due to ACL restriction

c. Protocol unreachable

d. Port could not be reached

54

You need to connect a switch to another switch/hub. What type of Ethernet cable should you

use?

a. Straight-through cable

b. Crossover cable

c. Rolled cable

55



What classless proprietary Cisco routing protocol supports routing protocols like IP, IPX,

AppleTalk and IPv6 by maintaining separate routing tables?

a. IGRP

b. RIP

c. EIGRP

d. OSPF

56

You need to connect your PC directly to a router. What type of Ethernet cable should you

use?

a. Straight-through cable

b. Crossover cable

c. Rolled cable

57

Where would you place extended access lists?

a. As close to the destination as possible

b. As close to the source as possible

58

What IOS command would you issue in privileged-mode to change the router configuration

stored on TFTP? a. config t

b. config mem

c. config net

d. config tftp

59

Which switching mode has the highest degree of error checking?

a. Fragment-Free

b. Fast-Forward

c. Cut-Through

d. Store-and-Forward

e. FIFO

60

What does the ping response C mean?

a. unreachable



b. congestion

c. user interrupt

d. unknown packet type

e. lifetime exceeded 61

What is responsible for ensuring a router is functional and the interfaces are present on

booting?

a. Bootstrap

b. POST

c. ROM monitor

d. NVRAM

e. Configuration register

62

Given the following status message, determine the most likely cause. Router#show interface

s0/0/0 Serial0/0 is down, line protocol is down a. Clock rate is not set or keepalives don't match

b. Cable or interface problem

c. The interface is shutdown

63 Store and forward switching method is best described by which of the following?

a. The entire frame is received before forwarding is commenced

b. Forwards frame after receiving destination address

c. Filters out collision packets by waiting for the first 64 bytes of data

64

Protocol Data Units of the Network layer are called?

a. Frames

b. Bits

c. Segments

d. Packets

65

What Cisco IOS enhanced editing command end the configuration mode and returns to EXEC?

a. Ctrl+Z

b. Ctrl+W



c. Ctrl+F

d. Esc+F

e. Tab

66

A CIDR value of /30 equates to what subnet mask?

a. 255.255.255.253

b. 255.255.255.128

c. 255.255.255.248

d. 255.255.255.252

67

When you connect to a remote router "out-of-band", via what port would you connect with? a. Console port

b. Auxiliary port

c. Ethernet port

d. Serial port

68

Which layer of the Cisco Hierarchical model controls workgroup and user access to the

internetwork? a. Core layer

b. Distribution layer

c. Access layer

69

What is used to identify Application layer services?

a. Encryption

b. Well-known ports

c. CRC

d. Protocol Data Units

70

What WLAN standard operates in the 2.4GHz band with a data rate of up to 54Mbps?

a. 802.11a

b. 802.11b



c. 802.11g

d. 802.11h

e. 802.11n

71

The Transport layer is...

a. Connectionless

b. Connection-oriented

c. Both

72

What is the Protocol Data Unit (PDU) of the Data Link layer called?

a. Bits

b. Segment

c. Packet

d. Frame

73

Which of the following commands would correctly add a message of the day banner?

a. Router (config)#banner #

b. Router(config)#banner motd #

c. Router#banner motd #

d. Router#banner #

74

A connection that uses a three-way handshake is considered a...

a. Connection-oriented connection

b. Connectionless connection

75

Connecting multiple nodes to a switch port using a hub is...?

a. Not possible

b. Not supported by all switches

c. Not recommended

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