Deck 2: How Lan and Wan Communications Work

Question 1

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

Answer 1

D

Question 2

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

Answer 2

B

Question 3

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

Answer 3

True

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

____ 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 6

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 7

Which layer governs a user's access to network services?

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

Question 8

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

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

Question 9

The information from one layer that is transferred to the next is called which of the following?

A)PDU
B)packet
C)bit
D)peer

Question 10

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

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

Question 11

Which layer is responsible for establishing and maintaining the communications link between nodes?

A)Layer 2
B)Layer 3
C)Layer 4
D)Layer 5

Question 12

Which layer provides flow control and ensures data reliability from source to destination?

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

Question 13

Class A nodes in FDDI networks are servers or workstations.

Question 14

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

Question 15

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

Question 16

Which layer can route data on different paths by creating virtual circuits?

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

Question 17

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

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

Question 18

The smallest T-carrier service is T-1,offering 1.544 Mbps bandwidth.

Question 19

One task of the ____ layer in a LAN is to handle error detection using a CRC.

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

Question 20

Which of the following is NOT a field in an Ethernet frame?

A)Destination address
B)Length
C)port
D)FCS

Question 21

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
a specialized hub that ensures
the packet is transmitted around the ring of computers.

Question 22

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
enables Network layer to determine which network process at the destination should accept a frame.

Question 23

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 24

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
discrete unit of data containing control and address information corresponding to OSI Data Link layer.

Question 25

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
uses distinct voltages to generate binary ones or zeroes.

Question 26

____________________ is the part of the CSMA/CD media access method in which a node listens for packet traffic before sending data.(Please do not abbreviate the answer.)

Question 27

Which of the following is an address associated with a NIC?

A)IP
B)port
C)session
D)MAC

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

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
enable an OSI layer on a sending node to communicate with the same layer on the receiving node.

Question 30

The ________________________________________ switching technique divides channels into distinct time slots.

Question 31

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
the OSI model layer where packets are forwarded

Question 32

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

Question 33

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

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

Question 34

Which of the following are common switching techniques used in WANs? (Choose all that apply.)

A)Packet switching
B)Circuit switching
C)Port multi-access
D)TDMA

Question 35

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

Question 36

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
the OSI model layer that is responsible for tracking ports or sockets

Question 37

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

Question 38

Which of the following are Ethernet transmission rates? (Choose all that apply.)

A)100 Mbps
B)40 Mbps
C)40 Gbps
D)100 Kbps

Question 39

Which of the following are 4G wireless network technologies? (Choose all that apply.)

A)CDMA 2000
B)3GPP LTE
C)EDGE
D)WiMax

Question 40

Which of the following are components of a Cable TV WAN? (Choose all that apply.)

A)headend
B)trunk line
C)distribution point
D)56K analog modem

Question 41

Describe the function of the Network layer of the OSI model.

Question 42

What is a Request for Comment (RFC)?

Question 43

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

Question 44

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
the OSI model layer which involves network connectors and media

Question 45

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

Question 46

Match each term with the correct statement below.
a.Transport
b.peer protocols
c.digital signal
d.Physical
e.Service access point (SAP)
f.frame
g.packet radio
h.multistation access unit (MAU)
i.Network
form of wireless WAN communication that takes place at very high radio frequencies.

Question 47

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

Question 48

Define and describe the media access control method used by Ethernet.

Question 49

Compare and contrast FDDI to the token ring access method.

Question 50

Describe the packet switching WAN transmission method.

Question 51

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

Question 52

Explain how the Transport layer uses several reliability measures.