Deck 17: Access Network & LAN

Question 1

The simplest network topology is:

A) mesh
B) ring
C) point-to-point
D) multipoint
E) bus

Answer 1

point-to-point

Question 2

Bus topology is rarely used for anything except ________.

Answer 2

LANs

Question 3

A group of data communications devices such as computers, file servers, printers, and an e-mail server that are tied together allowing each to share network resources is referred to as a:

A) LAN
B) WAN
C) DCCD
D) DDS

Answer 3

LAN

Question 4

Ethernet uses a mesh topology.

Question 5

The physical cable used to connect Ethernet LANs varies depending on all of the following except:

A) structure of the building or buildings
B) level of maintenance required
C) distance the signal has to travel
D) number of devices connecting to the network
E) amount of traffic expected

Question 6

The most important criteria to use in deciding which type of medium to use to connect Ethernet LANs is the distance between the devices.

Question 7

Token ring LANs are configured logically as a ring, but physically as a(n) ________.

Question 8

Token ring LANs have diminished in popularity because:

A) each time a new device is added to the LAN or taken off the LAN, service to all devices on the LAN is disrupted
B) only eight devices are allowed per MSAU, fewer than the thirty devices per segment on the Ethernet LAN
C) both of the above
D) neither of the above

Question 9

Token ring LANs are as popular as ever.

Question 10

The purpose of the token in token ring topology is to ensure that the network is fully utilized while reducing the possibility of contention between workstations.

Question 11

Which of the following is a device used at the edge of the network to aggregate DSL circuits together onto one ingress circuit that connects to the central switch site?

A) RAS
B) DSLAM
C) ATM access concentrators
D) FRAD

Question 12

The purpose of a(n) ________ is to convert a digital signal into an analog signal.

Question 13

DSL lines terminate into DSL modems at the customer premises the same way that analog line modems terminate, the key difference between the two technologies being that the ________ modem is always on.

Question 14

A channel service unit (CSU) or digital service unit (DSU) is used to connect digital circuits from the ________ to the computing device defined as the DTE.

Question 15

The real advantage that DSL provides is the increased bps rate obtained on the standard copper pair.

Question 16

Which of the following protocols has emerged as the new darling in the access network?

A) ATM
B) IP
C) Ethernet
D) SONET
E) ISDN

Question 17

How many TDM channels fit into one Fast Ethernet circuit?

A) 24
B) 28
C) 36
D) 18
E) None of the above

Question 18

The bps rate of a GigE circuit is ________.

Question 19

The bps rate of a FastE circuit is ________.

Question 20

Voice over IP rides across the network on a ________ pipe.

Question 21

A VLAN refers to a connection path between a SONET interface port and an ISDN terminal.

Question 22

Digital Subscriber Line may offer a symmetrical or asymmetrical broadband circuit.

Question 23

Both the Cable Modem and the DSL Modem interconnect to the end host device via an ________ interface.

Question 24

Fiber optic cable is starting to be deployed in the access space more frequently than it was 10 year ago.

Question 25

A GigE and FastE circuit provided to an end customer typically rides on copper cable.

Question 26

One reason Ethernet drops have become so popular in the access space is:

A) Simple to configure
B) Inexpensive equipment
C) Familiarity by LAN support personnel
D) High bandwidth
E) All of the above

Question 27

Which of the circuits listed below is not deployed in the access network.

A) Ethernet
B) ISDN PRI
C) DS1
D) DWDM
E) DS3
F) SONET OC-12

Question 28

The size of a SONET mux deployed in the access space ranges from:

A) OC-3 to OC-192
B) OC12 to OC-48
C) OC-3 to OC-12
D) None of the above

Question 29

A NGDLC is designed to drop many types of special service circuits such as ISDN, FX, DSL, etc.

Question 30

Access network SONET muxes need cross connect matrix capable of grooming low speed ________ circuits.