Deck 11: Local Area Network Overview

Question 1

A hub can be configured to recognize a malfunctioning station that is jamming the network and to cut that station out of the network.

Answer 1

True

Question 2

Local Area Networks are usually owned by the organization that is using the network to interconnect equipment.

Answer 2

True

Question 3

In a star topology a repeater may also function as a device attachment point.

Answer 3

False

Question 4

A ________ local area network consists of a closed loop of repeaters that allow data to circulate around the ring.

A)FDDI
B)ring
C)star
D)tree

Question 5

A ________ is where the destination MAC address indicates that all devices on the LAN should receive a copy of the frame.

A)unicast address
B)multicast address
C)simulcast address
D)broadcast address

Question 6

A transmission of a frame by any one station in a bus or tree topology can be heard by other stations.

Question 7

Each station attaches to the network at a repeater in the star topology and can transmit data onto the network through the repeater.

Question 8

WANs have much greater capacity than LANs to carry what is generally a greater internal communications load.

Question 9

Transmission is generally in the form of frames when using a ring topology.

Question 10

The simplest approach to interconnecting multiple LANs within an organization is to use a ________.

A)hub
B)bridge
C)switch
D)gateway

Question 11

A ________ LAN includes a central node to which stations are attached.

A)bus
B)star
C)tree
D)ring

Question 12

A ________ is a logical subgroup within a LAN that is created by software rather than physically moving and separating devices.

A)SAN
B)VAN
C)SLAN
D)VLAN

Question 13

Unicast addressing is where the destination address in the MAC frame designates a unique destination.

Question 14

One simple approach to improving efficiency is to physically partition the LAN into separate broadcast domains.

Question 15

The choice for transmission medium and topology is critical in LAN design.

Question 16

The bridge provides an extension to the LAN once modifications to the communications software in the stations attached to the LAN are made.

Question 17

Switches and hubs form the basic building blocks of most local area networks.

Question 18

A set of standards has not yet been defined for LANs that specify a range of data rates due to the variety of topologies and transmission media.

Question 19

The key elements of the local area network determine the cost and capacity of the LAN,the type of data that may be transmitted,the speed and efficiency of communications,and the kinds of applications that can be supported.

Question 20

A router is not required to link from one VLAN to another.

Question 21

Which of the following is NOT a characteristic of a bridge?

A)The bridge makes no modification to the content or format of the frames it receives.
B)The bridge must contain addressing and routing intelligence.
C)There may not be more than two LANs interconnected by a number of bridges.
D)The bridge should contain enough buffer space to meet peak demands.

Question 22

The tree layout begins at a point known as the ________.

Question 23

LDPC codes exhibit performance in terms of bit error probability that is very close to the ________ limit and can be efficiently implemented for high-speed use.

Question 24

In the ________ topology each station is directly connected to a common central node,typically via two point-to-point links,one for transmission and one for reception.

Question 25

The key elements of a local area network are medium access control,transmission medium,wiring layout,and ________.

Question 26

The term ________ means that all users share a common MAC broadcast address.

A)broad
B)SAN
C)flat
D)storm

Question 27

The ________ topologies are passive sections of cable to which stations are attached.

A)tree and ring
B)tree and bus
C)star and tree
D)bus and ring

Question 28

The principle disadvantage of VLAN "membership by port group" is that ________.

A)it requires switches to examine portions of the MAC frame above the MAC layer causing a performance impact
B)VLAN membership must be assigned initially
C)it is relatively easy to configure
D)the network manager must reconfigure VLAN membership when an end system moves from one port to another

Question 29

The ________ topology is a special case of the tree topology,with only one trunk and no branches.

Question 30

In the ________ topology the transmission medium is a branching cable with no closed loops.

A)bus
B)linear
C)ring
D)tree

Question 31

The key parameters in any medium access control technique are ________.

A)when and where
B)where and how
C)how and when
D)why and how

Question 32

The ________ specifies the mechanisms for addressing stations across the medium and for controlling the exchange of data between two users.

A)MAC
B)LLC
C)LAN
D)PDU

Question 33

The central element of the star topology is a ________.

A)router
B)hub
C)subnetwork
D)switch

Question 34

The term ________ refers to the way in which the end points,or stations,attached to the network are interconnected.

A)control link
B)topology
C)medium
D)medium access link

Question 35

There are four alternative media that can be used for a bus LAN: baseband coaxial cable,broadband coaxial cable,optical fiber,and ________.

Question 36

The network consists of a set of ________ joined by point-to-point links in a closed loop in the ring topology.These are capable of receiving data on one link and transmitting them,bit by bit,on the other link as fast as they are received.

Question 37

The total collection of devices that receive broadcast frames from each other is referred to as a ________.

Question 38

A ________ consists of a shared transmission medium and a set of hardware and software for interfacing devices to the medium and regulating the orderly access to the medium.

Question 39

In the ________ all stations attach directly to a linear transmission medium.A transmission from any station propagates the length of the medium in both directions and can be received by all other stations.

A)backend network
B)bus topology
C)tree topology
D)medium access link

Question 40

A ________ is a broadcast domain consisting of a group of end stations,perhaps on multiple physical LAN segments,that are not constrained by their physical location and can communicate as if they were on a common LAN.

Question 41

The ________ is designed for use between local area networks that use identical protocols for the physical and link layers and,because the devices all use the same protocols,the amount of processing here is minimal.

Question 42

The function of a ________ protocol is to control access to the transmission medium in order to provide for an orderly and efficient use of that capacity.

Question 43

Store-and-forward switch and cut-through switch are two types of ________ switches that are available as commercial products.

Question 44

The basic logical link control protocol is modeled after ________ and has similar functions and formats.

Question 45

The ________ approach is a mechanism in which bridges automatically develop a routing table and update that table in response to changing topology.