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Braindumps of 642-811

Building Cisco® Multilayer Switched Networks

 

Exam Questions, Answers, Braindumps (642-811)

The exam is tough but the guide from www.exams.ws was really helpfu.. Thanks to the dumpers.

 

QUESTION 1

In the Enterprise Composite Network Model; what are three of the functional areas? (Choose three)

A. Enterprise Campus

B. Enterprise Edge

C. Service Provider Edge

D. Building Access

E. Server Farm

F. Campus Backbone

Answer: A, B, C

A, B, C as it is for the enterprise composite network model not enterprise campus.

_________________________________

QUESTION 2

Which of the protocols below happen to be very closely related standards? (Choose two.)

A. DSL

B. ATM

C. SDH

D. FDDI

E. SONET

Answer: C, E

Explanation:

SDH and Sonet are both optical-based physical layer protocols one ITU and the other ANSI. SDH is the European standard while Sonet is an American standard

Incorrect Answer:

B: ATM is a cell-based layer two protocol.

Explanation:

Synchronous Digital Hierarchy. The European standard that defines a rate and format for transmission of optical signals over fiber using ATM and SONET. In contrast to PDH, SDH provides for a synchronous multiplexing scheme.

Reference:

http://www.cisco.com/en/US/products/hw/optical/ps2011/prod_technical_Reference09186a00800a8655.html#998751

_________________________________

QUESTION 3

Which statement correctly describes the extended system ID?

A. It is the 2-bit number of the MSTP instance.

B. It is the VLAN identifier value and allows for 4096 BIDs to be uniquely identified.

C. It is the bridge MAC address which is allocated from a pool of MAC addresses that are factory assigned.

D. It is a hex number used to measure the pReference of a bridge in the spanning-tree algorithm.

Answer: B

According to Cisco white paper:Extended System ID

A 12-bit extended system ID field is part of the bridge ID. Chassis that support only 64 MAC addresses always use the 12-bit extended system ID. On chassis that support 1024 MAC addresses, you can enable use of the extended system ID. STP uses the VLAN ID as the extended system ID. See the "Enabling the Extended System ID" section.

_________________________________

QUESTION 4

You are a CCNP in the midst of completing a switching solution. You are contemplating the use of UTP cable. What is the maximum distance in metres (between the punch block and the switch) that you can use?

A. 100

B. 150

C. None of the choices.

D. 200

E. 480

Answer: A

Explanation:

According to Cisco: The maximum length for an unshielded twisted pair (UTP) cable segment is 100 meters. The maximum length for a fiber cable is 2 km. According to webopedia.com: UTP - Short for Unshielded Twisted Pair, a popular type of cable that consists of two unshielded wires twisted around each other. Due to its low cost, UTP cabling is used extensively for local-area networks (LANs) and telephone connections. UTP cabling does not offer as high bandwidth or as good protection from interference as coaxial or fiber optic cables, but it is less expensive and easier to work with.

_________________________________

QUESTION 5

What kind of cable should you use to connect a router, server, or individual workstation to a switch?

A. rollover cable

B. crossover cable

C. straight cable

D. coax cable

Answer: C

Explanation:

To connect to a switch you have to use a straight cable. A rollover cable is used to connect to the console port of a switch or a router. Crossover cables are used to connect: two computers, two hubs, a hub to a switch, a cable modem to a router, or two router interfaces together.

_________________________________

QUESTION 6

Which of the following cable types are appropriate for Gigabit Ethernet applications? (Select two)

A. Cat-3 UTP

B. Cat-5 UTP

C. RG-58 coax

D. 50 micron MMF

E. 62.5 micron SMF

Answer: B, D

Explanation:

Gigabit Ethernet Cabling and Distance Limitations

1000BASE-T EIA/TIA Category 5 UTP 4 100 m 1000BASE-SX Multimode fiber (MMF) with 62.5 micron core;850 nm laser 1 275 m

MMF with 50 micron core; 850 nm laser 1 550 m

1000BASE-LX/LH MMF with 62.5 micron core; 1300 nm laser 1 550 m

Single-mode fiber (SMF) with 50 micron core;

1300 nm laser 1 550 m

B: 1000BaseT use category 5 UTP.

D: 1000BaseSX use 62.5 and 50-micron MMF

_________________________________

QUESTION 7

By what means could you provide a Layer 3 data path between two separate VLANs? (Choose two)

A. A VLAN trunking

B. An external router

C. An internal processor

D. VLAN capable bridge

E. EtherChannel

Answer: B, C

_________________________________

 

 

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