Quản trị mạng Chapter7

Quản trị mạng

Dao Xuan Hung - Take Exam

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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