Business Data Communication and Networks test bank

15147 words 61 pages
Which of the following is a data link layer function?

A) packetizing B) error and flow control

C) medium access control

The data link layer is responsible for _______ delivery.

C) hop-to-hop The data packet at the data link layer is usually called a _______.

A) frame The protocol for obtaining the physical address of a node when the IP address is known is called _______.

C)
ARP
A signal can lose energy due to the resistance of the medium. This is called _______.

D) attenuation _______ can cause errors during data transmission.

A)
White noise

B)
Impulse noise

C)
Echo

Which of the following best describes a single-bit error?

B)
A single bit is inverted per data unit.
If the ASCII character G is sent and
…show more content…
A)
Network
When data are transmitted from device A to device B, the header from A's layer 4 is read by B's _______ layer.

B)
Transport
The _______ layer changes bits into electromagnetic signals.

A)
Physical
Which of the following is an application layer service?

A)
Remote log-in

B)
File transfer and access

C)
Mail service

Why was the OSI model developed?

C)
Standards were needed to allow any two systems to communicate
The _______ model shows how the network functions of a computer ought to be organized.

B)
OSI
The physical layer is concerned with the movement of _______ over the physical medium.

D) bits The OSI model consists of _______ layers.

C) seven In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______.

B) removed In the OSI model, when data is transmitted from device A to device B, the header from A's layer 5 is read by B's _______ layer.

C) session In the OSI model, what is the main function of the transport layer?

B) process-to-process message delivery

In the OSI model, encryption and decryption are functions of the ________ layer.

C) presentation When a host on network A sends a message to a host on network B, which address does the router look at?

B) logical To deliver a message to the correct application program running on a host, the _______ address must be consulted.

A) port IPv6 has _______ -bit addresses.

C)
128
ICMPv6 includes _______.

A)
IGMP

B)
ARP

The ______ layer is

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