CCNA 4 - chapter 1

1. Which WAN technology allows telecommunication companies to offer enterprises services such as storage networking, secure Layer 2 and Layer 3 VPNs, and disaster recovery on public networks?
DSL
ATM
ISDN
metro Ethernet


2 .What three technologies are associated with ISDN PRI? (Choose three.)
DLCI
circuit switching
packet switching
data bearer channels
switched virtual circuits
time division multiplexing


3. What can cause a reduction in available bandwidth on a cable broadband connection?
smaller cells
number of subscribers
committed information rate
distance from the central office of the provider


4.At which two layers of the OSI model does a WAN operate? (Choose two.)
Physical Layer
Data Link Layer
Network Layer
Transport Layer
Presentation Layer
Application Layer

5 .Which device is used to establish the communications link between the customer equipment and the local loop for digital lines?
terminal adapter
modem
CSU/DSU
PBX switch
ISDN switch
Frame Relay Switch


6.Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched and permanent virtual circuits?
ATM
ISDN
Frame Relay
metro Ethernet

7.Which two devices are commonly used as data communications equipment? (Choose two.)
modem
router
CSU/DSU
ISDN switch
Ethernet switch

8.Which switching type will allow the communication devices in the provider's network to be shared and only allocated to an individual subscriber during data transfer?
circuit-switched
packet-switched
frame-switched
dedicated-switched lines
lease-switched

9.Virtual private networks (VPNs) use what type of connection from the remote site to the private network?
PVCs
DLCIs
tunnels
virtual circuits
dedicated Layer 2 links

10.Refer to the exhibit. The users in the branch office initiated three simultaneous calls to the HQ office. Which technology is used to ensure that a fixed-capacity connection is made available to each of the calls?
time-division multiplexing (TDM)
signaling
X.25
ISDN BRI


11. 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


12.Which three WAN devices can be found in the cloud? (Choose three.)

Ethernet switches
Frame Relay switches
ATM switches
bridges
core routers
repeaters


13.Which term describes a device that will put data on the local loop?
DLCI
CO
DCE
DTE
PRI
BRI

14.Which packet-switched WAN technology offers high-bandwidth connectivity capable of managing data, and video all on the same infrastructure?
Time Division Multiplexing (TDM)
metro Ethernet
Integrated Services Digital Network (ISDN)
Public Switched Telephone Network (PSTN)

15.What are two advantages of an analog PSTN WAN connection? (Choose two.)
low cost
availability
traffic encryption
available bandwidth
support for voice and video

16.Which three features are identified with Frame Relay connections? (Choose three.)
CIR
DLCI
DSLAM
PVC
SPID
53-byte cells

17.Which networking device is typically used to concentrate the dial-in and dial-out traffic of multiple users and from a network?
core router
access server
Frame Relay switch
ATM switch

18.What are three advantages of permanent dedicated circuits over shared lines such as Frame-Relay? (Choose three.)
dedicated bandwidth capacity
eliminates latency and jitter between endpoints
low cost of implementation
connections can be multiplexed over the same leased line
each endpoint has a dedicated physical router interface
eliminates point-to-point connections

19.A company needs a WAN connection that is capable of transferring voice, video, and data at a minimum rate of 155 Mbps. Which WAN connection is the best choice?
X.25
DSL
ATM
ISDN BRI
ISDN PRI

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