Quản trị mạng Chapter7

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Exam questions


1 . Which of the following are related to Frame Relay? Choose three.
CIR
Be
Bc
BGP

2 . What does Frame Relay use to control congestion? Choose three.
DE
SDLC
BECN
FECN

3 . Based on the configuration shown, what is the CIR of interface Serial0.300? interface Serial0 no ip address
encapsulation frame-relay no fair-queue frame-relay traffic-shaping bandwidth 1536 interface Serial0.100 point-to-point ip
address 10.1.1.1 255.255.255.0 frame-relay interface-dlci 100 class Cisco interface Serial0.200 point-to-point ip address
10.1.2.1 255.255.255.0 frame-relay interface-dlci 200 class Cisco interface Serial0.300 point-to-point ip address 10.1.3.1
255.255.255.0 frame-relay interface-dlci 300 map-class frame-relay Cisco frame-relay cir 128000 frame-relay adaptive-
shaping becn
56 kbps
64 kbps
128 kbps
896 kbps
1536 kbps

4 . Which of the following are true regarding packet switching? Choose two.
A modem is used to enable devices to share packet switching circuits.
ATM, Frame Relay, SMDS, and X.25 are all examples of packet-switched WAN technologies.
Packet switching is a WAN switching method in which network devices share a single point-to-point link to transport

packets from a source to a destination across a carrier network.
A bridge is used to enable devices to share packet switching circuits.

5 . At which layers of the OSI reference model does Frame Relay operate? Choose two.
Network
Data Link
Physical
Transport

6 . What is the function of Frame Relay BECN?
Identifies the logical virtual circuit between CPE and the Frame-Relay switch
Signaling between the CPE and the Frame-Relay switch that is responsible for managing the connection and
maintaining status between devices
The rate at which a Frame-Relay switch agrees to transfer data
A frame sent from the Frame-Relay switch to the source router when network congestion is detected

7 . Compression is best used in which of the following situations?
Fast network links
Slow network links with no congestion
Frame Relay link with 10 percents – 40 percents utilization
BRI with constant 60 percents - 100 percents utilization

8 . What information is needed to choose a CIR (Committed Information Rate) for a Frame Relay network? Choose three.
Amount of expected interactive traffic

Amount of expected bandwidth regeneration
Amount of expected file and transfer traffic
Amount of expected broadcast traffic

9 . Which of the following are true regarding a DLCI (Data-Link Connection Identifier)? Choose two.
It identifies a Frame Relay virtual circuit
It helps a Token Ring network identify the active monitor
It is usually assigned by the Frame Relay service provider
It must be the same for all DTE devices on the WAN

10 . Which of the following is true of Frame Relay FECN and/or BECN? Choose one.
Logical virtual circuit between Customer Equipment and Frame-Relay network
The rate at which a Frame-Relay switch agrees to transfer data
Frame sent from the Frame-Relay network to a router when the network is congested
Signaling between Customer Equipment and Frame-Relay network responsible for connection management and
maintaining status

11 . How does Traffic Shaping help to reduce congestion on an internetwork?
Reduces the flow of outbound traffic from a router interface into a network backbone
Shapes frames to allow bit rounding
Allows multiple protocols to run on same network cable
Causes protocol swapping which reduces interoperability issues

12 . You have a hub-and-spoke Frame Relay network. None of the spoke routers can ping any other spoke routers, yet all
spoke routers can ping the hub router. What is a possible cause?
Disabled split horizon
Poison reverse issue
Inverse ARP issue
Spanning-tree loop

13 . Which of the following are true regarding LMI (Local Management Interface)? Choose two.
The LMI is a set of enhancements to the Frame Relay specification
It can be used only with an SVC (Switched Virtual Circuit)
It was developed by IBM
It offers a number of features called extensions for managing complex internetworks

14 . What set of Frame Relay enhancements offer extensions for managing complex internetworks?
CMT
SNMP
LMI
RMON

15 . You enable Frame Relay traffic shaping and configure a CIR of 64kbps. Using 125ms time interval, what will be the
value of the committed burst (Be).
32000 bits
24000 bits
16000 bits
8000 bits

16 . Frame Relay implements two congestion notification mechanisms. What are they?
DLCI
CSMA
FECN
BECN

17 . What two general categories do Frame Relay devices fall under?
CSU
DSU
DTE
DCE

18 . Which one of the following is true regarding a Frame Relay DLCI?
It is a frame sent from the Frame-Relay switch to the destination router when network congestion is detected
It is the frame sent from the Frame-Relay network to a router when the network is congested
It is the logical virtual circuit between Customer Equipment and the Frame-Relay network
It is the rate at which a Frame-Relay switch agrees to transfer data

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