Deck 7: WANs and Remote Connectivity

Question 1

At the customer's demarcation point,either inside or outside the building,T-carrier wire pairs terminate with a ____.

A) terminal adapter
B) smart jack
C) CSU/DSU
D) switch

Answer 1

B

Question 2

ATM is a WAN technology that functions in the Data Link layer.

Answer 2

True

Question 3

SONET specifies framing and multiplexing techniques at the Physical layer.

Answer 3

True

Question 4

A ____ aggregates multiple DSL subscriber lines and connects them to the carrier's CO.

A) terminal adapter
B) DSLAM
C) smart jack
D) terminator

Question 5

A PSTN offers ____ security.

A) exceptional
B) marginal
C) expanded
D) dedicated

Question 6

A ____ converts digital signals into analog signals for use with ISDN phones and other analog devices.

A) terminal adapter
B) DSLAM
C) smart jack
D) terminator

Question 7

In a process called ____,two 64-Kbps ISDN B channels can be combined to achieve an effective throughput of 128 Kbps.

A) slicing
B) linking
C) merging
D) bonding

Question 8

The PPTP VPN tunneling protocol is based on technology developed by Cisco.

Question 9

On most modern WANs,a ring topology relies on ____ rings to carry data.

A) flexible
B) open
C) serial
D) redundant

Question 10

Broadband cable requires many subscribers to share the same local line,thus raising concerns about ____ and actual (versus theoretical)throughput.

A) access
B) costs
C) noise
D) security

Question 11

The portion of the PSTN that connects any residence or business to the nearest CO is known as the ____.

A) demarcation point
B) NIU (Network Interface Unit)
C) local loop
D) central office

Question 12

What sets ATM apart from Ethernet is its ____ size.

A) channel
B) frame
C) variable packet
D) fixed packet

Question 13

ISDN PRI uses ____ B channels and one 64-Kbps D channel.

A) 10
B) 12
C) 23
D) 32

Question 14

____ is an updated,digital version of X.25 that also relies on packet switching.

A) DSL
B) ISDN
C) Frame relay
D) ATM

Question 15

In a star topology,a single connection failure will halt all traffic between all sites.

Question 16

Because WAN connections require routers or other Layer 3 devices to connect locations,their links are not capable of carrying ____ protocols.

A) open
B) standard
C) routable
D) nonroutable

Question 17

The speed of a T-carrier depends on its ____ level.

A) signal
B) hierarchy
C) channel
D) traffic

Question 18

The individual geographic locations connected by a WAN are known as ____.

A) WAN sites
B) WAN links
C) network service providers
D) central offices

Question 19

Dial-up ISDN does not convert a computer's digital signals to analog before transmitting them over the PSTN.

Question 20

WANs typically send data over ____ available communications networks.

A) privately
B) publicly
C) individually
D) serially

Question 21

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Occurs when downstream throughput is higher than upstream throughput.

Question 22

____________________ encapsulates incoming Ethernet or token ring frames,then converts them into ATM cells for transmission over an ATM network.

Question 23

____ virtual computing allows a user on one computer,called the client,to control another computer,called the host or server,across a network connection.

A) Random
B) Network
C) Open
D) Remote

Question 24

____________________ are connections between network nodes that,although based on potentially disparate physical links,logically appear to be direct,dedicated links between those nodes.

Question 25

The data rate of a particular SONET ring is indicated by its ____,a rating that is internationally recognized by networking professionals and standards organizations.

A) OC (Optical Carrier) level
B) CIR (committed information rate)
C) BRI (Basic Rate Interface)
D) DS0 (digital signal, level 0)

Question 26

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Occurs when data travels from the carrier's switching facility to the customer.

Question 27

____ is the standard for connecting home computers to an ISP via DSL or broadband cable.

A) SLIP
B) SLIPoE
C) PPP
D) PPPoE

Question 28

____ networking refers to dialing directly into a private network's or ISP's remote access server to log on to a network.

A) Remote
B) Direct
C) Dial-up
D) Virtual

Question 29

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Contain sites that are connected in star or ring formations are interconnected at different levels,with the interconnection points being organized into layers to form hierarchical groupings.

Question 30

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Contains a single site acting as the central connection point for several other points.

Question 31

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Incorporates many directly interconnected sites.

Question 32

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Occurs when each site is directly connected to no more than two other sites in a serial fashion.

Question 33

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Occurs when data travels from the customer to the carrier's switching facility.

Question 34

____________________ is the remote virtual computing software that comes with Windows client and server operating systems.

Question 35

____ is the preferred communications protocol for remote access communications.

A) SLIP
B) IP
C) PPP
D) TCP/IP

Question 36

___________________________________ is an open source system designed to allow one workstation to remotely manipulate and receive screen updates from another workstation.

Question 37

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Provides equal capacity for data traveling both upstream and downstream.

Question 38

A(n)____________________ uses TDM (time division multiplexing)over two wire to divide a single channel into multiple channels.

Question 39

SONET's extraordinary ____ results from its use of a double-ring topology over fiber-optic cable.

A) throughput
B) low cost
C) fault tolerance
D) latency

Question 40

MATCHING
Match each item with a statement below:
a.bus topology WAN
f.upstream
b.star topology WAN
g.asymmetrical communications
c.mesh topology WAN
h.symmetrical technology
d.tiered topology WAN
i.signal level
e.downstream
Refers to the T-carrier's Physical layer electrical signaling characteristics as defined by ANSI standards in the early 1980s.

Question 41

Explain how ATM relies on virtual circuits.

Question 42

Explain how a cable modem is utilized in broadband cable connections.

Question 43

Define and describe RRAS.

Question 44

Define a fractional T1 and explain why an organization might implement it.

Question 45

Describe the most important advantage of SONET.

Question 46

Describe an important difference between frame relay and X.25.

Question 47

Define and describea PSTN.

Question 48

Define the term xDSL and name the better known DSL varieties.

Question 49

Describe two important considerations when designing a VPN.

Question 50

Describe the fundamental properties WANs and LANs have in common.