Deck 2: How Lan and Wan Communications Work

Question 1

In a connectionless service, there is no acknowledgment that a frame has been received.

Answer 1

True

Question 2

Class A nodes in FDDI networks are servers or workstations.

Answer 2

False

Question 3

Two-way alternate (TWA)mode for dialog control is used in ____ communications.

A)simplex
B)complex
C)half duplex
D)full duplex

Answer 3

C

Question 4

The token ring transport method uses a physical ____ topology along with the logic of a ring topology.

A)bus
B)star
C)mesh
D)grid

Question 5

The upstream and downstream frequencies used by cable modems may be the same.

Question 6

The OSI model consists of ____ distinct layers stacked on one another.

A)two
B)three
C)five
D)seven

Question 7

____ is a process that scrambles the data so that it cannot be read if intercepted by unauthorized users.

A)Encryption
B)Decryption
C)Deciphering
D)Decoding

Question 8

A Class ____ protocol within the Transport layer provides an option to recover lost packets in certain situations.

A)0
B)1
C)2
D)3

Question 9

Information from one layer is transferred to the next by means of commands called ____.

A)primitives
B)pointers
C)primaries
D)messages

Question 10

Analog signals are the basis of the most common signaling method used on LANs and high-speed WANs.

Question 11

The Ethernet protocol permits only one node to transmit at a time.

Question 12

Both standard 802.3 and Ethernet II can have ____ optional field(s)between the length or type field and the data field

A)one
B)two
C)three
D)four

Question 13

____ circuits are logical communication paths set up to send and receive data.

A)Electric
B)Physical
C)Closed
D)Virtual

Question 14

The task of the ____ layer in a LAN is to organize bits so that they are formatted into frames.

A)Network
B)Transport
C)Data Link
D)Physical

Question 15

The term ____ refers to wrapping the information in one layer inside the information within the next layer.

A)encase
B)enclose
C)encapsulate
D)envelope

Question 16

A(n)____ is a connection identification assigned by the Session layer.

A)MAC address
B)IP address
C)port
D)network id

Question 17

A(n)____ signal can vary continuously, as in a wave pattern with positive and negative voltage levels.

A)discrete
B)analog
C)digital
D)binary

Question 18

Computer programmers use the ____ layer to connect workstations to network services, such as linking an application into electronic mail.

A)Presentation
B)Application
C)Session
D)Transport

Question 19

The ____ field in an Ethernet frame synchronizes frame transmission and consists of an alternating pattern of zeroes and ones.

A)data and pad
B)frame check sequence (FCS)
C)start of frame delimiter (SOF)
D)preamble

Question 20

Ethernet transport (the IEEE 802.3 specification), takes advantage of the ____ and star topologies.

A)bus
B)torus
C)mesh
D)tree

Question 21

Describe the role of the headend in the star topology of a Cable TV WAN.

Question 22

The ________________________________________ switching technique divides channels into distinct time slots.

Question 23

Provide a high-level description of the bottom, middle, and top layers of the OSI model.

Question 24

____ switching establishes a dedicated circuit between the two transmitting nodes, but the circuit is a logical connection and not a physical one.

A)Packet
B)Frame
C)Circuit
D)Message

Question 25

Compare and contrast FDDI to the token ring access method.

Question 26

Describe the role of the active monitor in a token ring network.

Question 27

LAN and WAN communications have been generally guided by a network communications model called the ___________________________________ reference model.

Question 28

A(n)____ line is a dedicated telephone line that can be used for data communications to connect two different locations for continuous point-to-point communications.

A)DSL
B)LATA
C)T-carrier
D)IXC

Question 29

The ____ field of a token identifies the frame as a data frame or as a frame used for network management, such as reporting network errors.

A)access control
B)frame check sequence
C)frame status
D)frame control

Question 30

If no broadcasts are detected from the active monitor or any one of the standby monitors, a ring goes into a ____ condition.

A)signaling
B)beaconing
C)messaging
D)broadcasting

Question 31

What are electromagnetic interference (EMI)and radio frequency interference (RFI)?

Question 32

Explain how TWS (two-way simultaneous)dialog control and buffering enable full duplex communications.

Question 33

The Microsoft Windows ____________________ is a service that makes one computer visible to another for access through the network.

Question 34

In the ____ switching technique, the bandwidth of communications medium is dynamically allocated based on application need.

A)Time Division Multiple Access
B)Frequency Division Multiple Access
C)circuit
D)Statistical multiple access

Question 35

____ communications in FDDI networks are used for time-sensitive transmissions requiring continuous transmission.

A)Synchronous
B)Asynchronous
C)Modulated
D)Amplified

Question 36

What is a Request for Comment (RFC)?

Question 37

Describe the relationship between the service data unit (SDU)and protocol data unit (PDU).

Question 38

The ____________________ layer of the OSI model controls the passage of packets along routes on the network.

Question 39

____________________ is the process of checking communication media for a specific voltage level indicating the presence of a data-carrying signal.

Question 40

What is the role of the media access control (MAC)sublayer of the Data Link layer?

Question 42

Describe the topology of wireless WANs using radio communications.