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NO.1 Which protocol uses a connection-oriented service to deliver files between end systems?

A. TFTP

B. DNS

C. FTP

D. SNMP

E. RIP

Answer: C

Explanation:

FTP is an acronym for File Transfer Protocol. As the name suggests, FTP is used to transfer files

between computers on a network. You can use FTP to exchange files between computer accounts,

transfer files between an account and a desktop computer, or access online software archives

 

NO.2 Which OSI layer header contains the address of a destination host that is on another network?

A. application

B. session

C. transport

D. network

E. data link

F. physical

Answer: D

Explanation:

Only network address contains this information. To transmit the packets the sender uses network

address and datalink address. But the layer 2 address represents just the address of the next hop

device on the way to the sender. It is changed on each hop. Network address remains the same.

 

NO.3 Refer to the exhibit.

If host A sends an IP packet to host B, what will the source physical address be in the frame when it

reaches host B?

A. 10.168.10.99

B. 10.168.11.88

C. A1:A1:A1:A1:A1:A1

D. B2:B2:B2:B2:B2:B2

E. C3:C3:C3:C3:C3:C3

F. D4:D4:D4:D4:D4:D4

Answer: E

Explanation:

When packets transfer from one host to another across a routed segment, the source IP address

always remains the same source IP address, and the source physical (MAC) address will be the

existing router's interface address. Similarly, the destination IP address always remains the same

and the destination physical (MAC) address is the destination router's interface address.

 

NO.4 Refer to the exhibit.

If the hubs in the graphic were replaced by switches, what would be virtually eliminated?

A. broadcast domains

B. repeater domains

C. Ethernet collisions

D. signal amplification

E. Ethernet broadcasts

Answer: C

Explanation:

Modern wired networks use a network switch to eliminate collisions. By connecting each device

directly to a port on the switch, either each port on a switch becomes its own collision domain (in

the case of half duplex links) or the possibility of collisions is eliminated entirely in the case of full

duplex links.

 

NO.5 Which three statements are true about the operation of a full-duplex Ethernet network?

(Choose three.)

A. There are no collisions in full-duplex mode.

B. A dedicated switch port is required for each full-duplex node.

C. Ethernet hub ports are preconfigured for full-duplex mode.

D. In a full-duplex environment, the host network card must check for the availability of the network

media before transmitting.

E. The host network card and the switch port must be capable of operating in full-duplex mode.

Answer: A,B,E

 

NO.6 Refer to the exhibit.

HostX is transferring a file to the FTP server. Point A represents the frame as it goes toward the

Toronto router. What will the Layer 2 destination address be at this point?

A. abcd.1123.0045

B. 192.168.7.17

C. aabb.5555.2222

D. 192.168.1.1

E. abcd.2246.0035

Answer: E

Explanation:

For packets destined to a host on another IP network, the destination MAC address will be the LAN

interface of the router. Since the FTP server lies on a different network, the host will know to send

the frame to its default gateway, which is Toronto.

 

NO.7 Which layer of the TCP/IP stack combines the OSI model physical and data link layers?

A. Internet layer

B. transport layer

C. application layer

D. network access layer

Answer: D

Explanation:

The Internet Protocol Suite, TCP/IP , is a suite of protocols used for communication over the internet.

The TCP/IP model was created after the OSI 7 layer model for two major reasons. First, the

foundation of the Internet was built using the TCP/IP suite and through the spread of the World

Wide Web and Internet, TCP/IP has been preferred. Second, a project researched by the

Department of Defense (DOD) consisted of creating the TCP/IP protocols. The DOD's goal was to

bring international standards which could not be met by the OSI model. Since the DOD was the

largest software consumer and they preferred the TCP/IP suite, most vendors used this model rather

then the OSI. Below is a side by side comparison of the TCP/IP and OSI models.

TCP/IP Model VS. OSI Model Application Layer 7 Application Layer 6 Presentation Layer 5 Session

Transport Layer 4 Transport Internet Layer 3 Network Network Access Layer 2 Data Link Layer 1

Physical

 

NO.8 Refer to the exhibit.

The host in Kiev sends a request for an HTML document to the server in Minsk. What will be the

source IP address of the packet as it leaves the Kiev router?

A. 10.1.0.1

B. 10.1.0.5

C. 10.1.0.6

D. 10.1.0.14

E. 10.1.1.16

F. 10.1.2.8

Answer: E

Explanation:

Although the source and destination MAC address will change as a packet traverses a network, the

source and destination IP address will not unless network address translation (NAT) is being done,

which is not the case here.