Review Questions


1.

Which of the following ATM Adaptation layers would you choose if you were running LANE?

  1. AAL1

  2. AAL2

  3. AAL3/4

  4. AAL5

daal5 is the atm adaptation layer used when running ethernet on atm or lane.

2.

Which ATM protocol allows Ethernet network traffic to flow through as ATM?

  1. AAL2

  2. AAL3

  3. AAL5

  4. LANE

dlane (lan emulation) is the protocol used for ethernet on atm.

3.

Token Ring networks choose one device to be an active monitor. Of the following choices, which are performed by the active monitor? (Choose all that apply.)

  1. Removal of continuously circulating packets

  2. Promoting additional active monitors

  3. Issuing new tokens

  4. Ring timing

  5. Error detection

a, c, dthe active monitor is responsible for removing loose tokens sent by failed stations and issuing new tokens. the active monitor is also responsible for ring timing.

4.

Which layer of the OSI reference model do bridges work at?

  1. Session

  2. Bridge

  3. Network

  4. Data Link

dbridges are devices that operate at the data link layer. they forward frames between segments based on station mac addresses.

5.

If your customer needs to transfer voice and video, which require high network bandwidth, on what network design area should you focus your efforts?

  1. Network layer media

  2. Network layer protocols

  3. Transport layer

  4. Network layer management

adifferent types of media-coaxial cable, twisted pair, and fiber- support different transfer rates.

6.

What is the Network layer of the OSI reference model responsible for?

  1. Bridging

  2. Regenerating the digital signal

  3. Routing packets through an internetwork

  4. Gateway services

cthe network layer performs routing based on logical addressing and uses a best-path route determination for all packets.

7.

Match the datagram type to the layer of the OSI reference model where it is used. (Choose all that apply.)

  1. Application layer PDUs are also known as segments.

  2. Presentation layer PDUs are also known as frames.

  3. Session layer PDUs are also known as bits.

  4. Transport layer PDUs are also known as segments.

  5. Network layer PDUs are also known as packets.

  6. Data Link layer PDUs are also known as frames.

  7. Physical layer PDUs are also known as bits.

d, e, f, gpdus at the transport, network, data link, and physical layers are also known by the type of datagram unique to each layer. most other layers simply refer to the pdu type as datagrams.

8.

Which of the following pairs are Presentation layer standards? (Choose three.)

  1. MPEG and MIDI

  2. PICT and JPEG

  3. ASCII and EBCDIC

  4. NFS and SQL

a, b, cpresentation layer standards are responsible for conversion, formatting, and encapsulation.

9.

Which of the following are Session layer standards?

  1. MPEG and MIDI

  2. NFS and SQL

  3. ASCII and EBCDIC

  4. PICT and JPEG

bthe session layer includes standards used when two stations create a session and exchange data of a common file system.

10.

When a Token Ring device needs to transmit data, what must it first do?

  1. Create a token.

  2. Wait for a token.

  3. Wait for the NAUN to respond.

  4. Wait for the active monitor to poll it.

bpreventing data collisions, token ring networks use tokens to ensure that only one station is allowed to transmit while all other stations wait.

11.

Which three of the following are true statements about connection- oriented sessions? (Choose all that apply.)

  1. The segments delivered are acknowledged back to the sender upon their receipt.

  2. Any segments not acknowledged are dropped.

  3. Segments are sequenced back into their proper order upon arrival at their destination.

  4. A manageable data flow is maintained in order to avoid congestion, overloading, and the loss of any data.

a, c, dat the transport layer, segments are acknowledged and sequenced into their proper order. data flow is also a function of the transport layer that is used to avoid congestion and data loss.

12.

CPE is an acronym for which of the following?

  1. Central processing engineering

  2. Central processing equipment

  3. Customer processing equipment

  4. Customer premises equipment

dcustomer premises equipment (cpe) includes lan devices, a router, and usually a csu/dsu.

13.

CSU/DSU is an acronym for which of the following?

  1. Channel service unit/digital service unit

  2. Channel service unit/data service unit

  3. Channel service unit/digital service unit

  4. Can’t send in uniform/don’t send another unit

ba csu/dsu is included in cpe and is responsible for timing, and channel multiplexing and demultiplexing.

14.

Which of the following devices blocks broadcasts by default?

  1. Hubs

  2. Repeaters

  3. Switches

  4. Routers

drouters work at the network layer and prevent broadcasts from traveling across the network by creating broadcast domains.

15.

Which of the following methods can be used to attach FDDI devices? (Choose all that apply.)

  1. Single attachment stations

  2. Full-duplex stations

  3. Dual attachment stations

  4. Concentrators

  5. Half-duplex stations

a, c, dsass, dass, and concentrators are fddi devices used in fddi networks to allow for single or multiple connection points.

16.

Match the IEEE 802.3 protocol type to its corresponding physical medium. (Choose all that apply.)

  1. 10Base2 is also known as 50-ohm coax (thinnet).

  2. 10Base5 is also known as 50-ohm coax (thicknet).

  3. 10BaseFL is also known as UTP (unshielded twisted-pair).

  4. 10BaseT is also known as UTP (unshielded twisted-pair).

a, b, dthe ieee 802.3 protocol type defines many physical medium types. 10base2 designates a 10mbps baseband cable, with a limit of 200 meters.

17.

What are the advantages of using fiber rather than copper as a network medium? (Choose all that apply.)

  1. Security

  2. Low cost

  3. 100Mbps

  4. Larger network diameter

  5. Immunity to RFI and EMI

a, d, efiber medium is the most expensive medium type, but it provides many advantages over coax or twisted-pair cabling and can support much greater speeds.

18.

What type of media access is used by Ethernet?

  1. Multiplexing

  2. MAC addressing

  3. Polling

  4. Token passing

  5. Contention

econtention is another description for csma/cd. all stations contend for access to the media, and data collisions often occur.

19.

What type of media access is used by SDLC?

  1. Contention

  2. MAC addressing

  3. Polling

  4. Token passing

  5. Multiplexing

csdlc uses polling to determine which stations need to transmit to help prevent data collisions.

20.

Which type of simultaneous transmissions are supported by ISDN networks? (Choose all that apply.)

  1. Voice

  2. Frame Relay

  3. Video

  4. Data

  5. LANE

a, c, disdn networks were developed by the phone companies to support simultaneous transmission of voice, video, and data using analog phone lines with digital signaling.

Answers

1.

D AAL5 is the ATM Adaptation layer used when running Ethernet on ATM or LANE.

2.

D LANE (LAN Emulation) is the protocol used for Ethernet on ATM.

3.

A, C, D The active monitor is responsible for removing loose tokens sent by failed stations and issuing new tokens. The active monitor is also responsible for ring timing.

4.

D Bridges are devices that operate at the Data Link layer. They forward frames between segments based on station MAC addresses.

5.

A Different types of media—coaxial cable, twisted pair, and fiber— support different transfer rates.

6.

C The Network layer performs routing based on logical addressing and uses a best-path route determination for all packets.

7.

D, E, F, G PDUs at the Transport, Network, Data Link, and Physical layers are also known by the type of datagram unique to each layer. Most other layers simply refer to the PDU type as datagrams.

8.

A, B, C Presentation layer standards are responsible for conversion, formatting, and encapsulation.

9.

B The Session layer includes standards used when two stations create a session and exchange data of a common file system.

10.

B Preventing data collisions, Token Ring networks use tokens to ensure that only one station is allowed to transmit while all other stations wait.

11.

A, C, D At the Transport layer, segments are acknowledged and sequenced into their proper order. Data flow is also a function of the Transport layer that is used to avoid congestion and data loss.

12.

D Customer premises equipment (CPE) includes LAN devices, a router, and usually a CSU/DSU.

13.

B A CSU/DSU is included in CPE and is responsible for timing, and channel multiplexing and demultiplexing.

14.

D Routers work at the Network layer and prevent broadcasts from traveling across the network by creating broadcast domains.

15.

A, C, D SASs, DASs, and concentrators are FDDI devices used in FDDI networks to allow for single or multiple connection points.

16.

A, B, D The IEEE 802.3 protocol type defines many physical medium types. 10Base2 designates a 10Mbps baseband cable, with a limit of 200 meters.

17.

A, D, E Fiber medium is the most expensive medium type, but it provides many advantages over coax or twisted-pair cabling and can support much greater speeds.

18.

E Contention is another description for CSMA/CD. All stations contend for access to the media, and data collisions often occur.

19.

C SDLC uses polling to determine which stations need to transmit to help prevent data collisions.

20.

A, C, D ISDN networks were developed by the phone companies to support simultaneous transmission of voice, video, and data using analog phone lines with digital signaling.




CCDA. Cisco Certified Design Associate Study Guide
CCDA: Cisco Certified Design Associate Study Guide, 2nd Edition (640-861)
ISBN: 0782142001
EAN: 2147483647
Year: 2002
Pages: 201

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