81 Which service takes
information from multiple sources and allocates bandwidth on a
single media?
A. Time-division Multiplexing (TDM)
B. Signaling System 7 (SS7)
C. X.25
D. Frame relay
Ans A
82 Which three devices can be used to convert the user data
from the DTE into a form acceptable to the WAN service's
facility?
A. Modem
B. CSU/DSU
C. TA/NT1
D. CO
E. SS7
Ans A, B & C
A modem, CSU/DSU (Channel Service Unit/Data Service Unit), or
TA/NT1 (Terminal Adapter/Network Termination 1) can be used to
convert the user data from the DTE into a form acceptable to the
WAN service's facility.
83 What is the juncture at which the CPE ends and the local
loop portion of the service begins?
A. Demarc
B. CO
C. Local loop
D. Last-mile
Ans A
The demarcation or demarc is the juncture at which the CPE ends
and the local loop portion of the service begins. The CO
(Central Office) is the nearest point of presence for the
provider's WAN service. The local loop or "last-mile" is the
cabling that extends from the demarc into the WAN service
provider's central office.
84 You can access three forms of WAN services with Cisco
routers. Select the three forms:
A. Switched or relayed services
B. Interface front end to IBM enterprise data center computers
C. Using protocols that connect peer-to-peer devices like HDLC
or PPP encapsulation.
D. IPX/SPX
E. NetBEUI
Ans: A, B & C
You can access three forms of WAN services with Cisco routers.
Switched or relayed services include X.25, Frame Relay, and
ISDN. An interface front end to IBM enterprise data center
computers includes SDLC. And, you can access the services of WAN
providers using protocols that connect peer devices such as HDLC
and PPP encapsulation. IPX/SPX and NetBEUI are LAN protocols.
85 Select the fields for the Cisco HDLC protocol:
A. Flag, Address, Control
B. Flag, Address, Control, Protocol, LCP (Code, Identifier,
Length, Data), FCS, Flag
C. Flag, Address, Control, Data, FCS, Flag
D. Flag, Address, Control, Proprietary, Data, FCS, Flag
Ans D
The Cisco HDLC frame format is Flag, Address, Control
Proprietary, Data, FCS, Flag. The PPP frame format is Flag,
Address, Control, Protocol, LCP (Code, Identifier, Length,
Data), FCS, Flag. The SDLC and LAPB format is Flag, Address,
Control, Data, FCS, Flag.
85: Select the physical interfaces that PPP can be configured
on a Cisco router:
A. Asynchronous serial
B. HSSI
C. ISDN
D. Synchronous serial
Ans A, B, C & D
All four of them can carry PPP traffic. HSSI is High Speed
Serial Interface.
86 Select the correct statements about PPP and SLIP for WAN
communications?
A. PPP uses its Network Control Programs (NCPs) component to
encapsulate multiple protocols.
B. PPP can only transport TCP/IP
C. SLIP can only transport TCP/IP.
D. SLIP uses its Network Control Programs (NCPs) component to
encapsulate multiple protocols.
Ans A & C
87a Which protocol for PPP LCP (Link Control Protocol)
performs a challenge handshake?
A. CHAP
B. PAP
C. UDP
D. IPX
Ans: A
87b Which form of PPP error detection on Cisco routers
monitors data dropped on a link?
A. Quality
B. Magic Number
C. Error Monitor
D. Droplink
Ans: A
The Quality protocol monitors data dropped on a link. Magic
Number avoids frame looping.
88 Which protocol for PPP provides load balancing across
multiple links?
A. Multilink Protocol (MP)
B. Quality
C. Magic Number
D. Stacker
E. Predictor
Ans A
89 As the system administrator, you type "ppp authentication
chap pap secret". Which authentication method is used first in
setting up a session?
A. secret
B. PAP
C. CHAP
D. PPP/SLIP
Ans C
90 Select the compression protocols for PPP?
A. Stac
B. Predictor
C. Quality
D. Magic Number
Ans: A & B
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