Which of the following is commonly used as Data
Terminal Equipment?
ISDN
modem
router
CSU/DSU
2
Which term describes the cabling that connects the
customer site to the nearest exchange of the WAN service provider?
CPE
CO
local loop
DCE
DTE
3
On which of the following are most Layer 2 WAN
encapsulations based?
IP
PPP
HDLC
SLIP
HSSI
CSU
4
A U.S. company requires a WAN connection used only to
transfer sales data from individual stores to the home office. All
transfers will occur after business hours. The required bandwidth
for this connection is estimated to be less than 38 kbps. Which type
of connection requires the least investment for this company?
ATM
ISDN
analog dialup
T1 Leased Line
5
A company requires a WAN connection that will carry 64
kbps and allow fast call setup time. The connection does not need to
carry video. What is the best choice for this company?
ATM
ISDN BRI
X.25
analog dialup
6
Which of the following describes a packet-switched
network using connection-oriented data transfer? (Choose two.)
Each packet carries an identifier.
Each packet carries full addressing
information.
Each switch in the route must
evaluate the addressing information to determine where to send the
packet.
Each switch determines where to
send the packet by examining tables in memory.
The addressing information is used
to set switches along the route of data transfer to create a
continuous copper circuit.
7
Which of the following connections will provide the
equivalent of a T1/E1 connection and is intended for large
businesses?
BRI
PRI
DLCI
PSTN
POTS
8
A large company already has a T1 leased line but this
connection is inadequate at peak business hours. Furthermore, they
would like a backup WAN connection in case their leased line
temporarily fails. What type of WAN connection is commonly used in
this situation?
X.25
DSL
ISDN
cable modem
56 kbps
9
Which of the statements regarding DSL are correct?
(Choose three.)
DSL provides a consistent bandwidth
of 2.154 Mbps.
DSL connections provide a fast
dialup to establish a WAN connection.
DSL connects the local loop to a
digital subscriber line access multiplexer.
DSL bandwidth varies and can exceed
the bandwidth of a T1/E1 leased line.
For DSL to function properly, the
local loop must be less than 5.5 kilometers (3.5 miles).
DSL is a popular choice for
enterprises that need to connect home users to the local network due
to strong security.
10
A European company needs a low cost, dialup WAN
connection to validate transactions for point-of-sale card readers.
Which connection type is commonly used for this situation?
ATM
X.25
Frame Relay
Leased lines
11
Which statement is true regarding WAN technologies?
Most WANS use only one technology
throughout the infrastructure such as ISDN, Frame Relay or ATM.
Data transfer speeds on the WAN are
typically faster than the speeds on a LAN.
WANs operate at the lower three
layers of the OSI model.
WANs are unable to support the
transfer of voice or video traffic.
12
Depending on the company size and geographical layout,
there might be many end points on the company WAN. Why is it
important to identify all the end points of the WAN before choosing
a WAN design?
to determine the routing protocol
to be used on the WAN link
to determine the WAN topology
to determine the requirements for
latency and jitter
to determine the signaling protocol
to be used on the WAN link
13
Which of the following is true of WANs?
Shared network WAN technologies
such as Frame Relay and ATM are more expensive but offer less
latency and jitter than dedicated lines.
ISDN is suitable for large
enterprises.
The more network devices that data
has to pass through across the WAN, the more latency and less
reliability the network will experience.
WANs typically incorporate only one
technology such as ISDN, Frame Relay, or ATM.
14
Which statements are correct regarding ATM
connections? (Choose two.)
uses only PVCs
is useful for video transfers
has data rates beyond 155 Mbps
cells have 32 byte payload and a 5
byte overhead
mandates single virtual circuits on
a single leased line connection
15
Why is it important to identify the type of traffic
that will be carried on the WAN links before choosing a WAN
technology?
to determine the routing protocol
to be used on the WAN link
to determine the WAN topology
to determine the requirements for
latency and jitter
to determine the type of signaling
protocol to be used on the WAN link
16
A new international company needs to have a design for
WAN connectivity. The company will have at least five offices in
every state in the United States and Mexico. Some states will have
as many as 20 offices. The branch offices will require constant
contact with the services of the main office. Which design model is
best for WAN connectivity in this situation?
a mesh network of all branch WANs
a simple star topology connecting
all branch LANs to a central router with multiple interfaces
a one layer design using Frame
Relay links between LANs
a three layer hierarchical topology
interconnecting branch LANs within an area, the area LANs within a
region, and connecting the regions to form the core of the WAN