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Braindumps of 642-801

Building Scalable Cisco® Internetworks

 

Exam Questions, Answers, Braindumps (642-801)

Hi all.

I think it was tough but thanks to www.examcheats.net . I purchased their study material and got through. The stuff had drag and drops, exhibits and all that is required for the exam. 

 

Question: 1.

Which IOS features can be used to prevent routing loops between two autonomous systems

caused by running different routing protocols and having redundant paths between systems?

A. Route filtering

B. Passive interfaces

C. Static redistribution

D. Two-way redistribution

Answer: A

Explanation:

Two way redistribution If you must allow two-way redistribution, enable a mechanism to reduce

the chances of routing loops. Examples of mechanisms covered in this chapter are default routes,

route filters, and modification of the metrics advertised. With these types of mechanisms, you can

reduce the chances of routes imported from one autonomous system being injected into the

same autonomous system as new route information if more one boundary router is performing

two-way redistribution.

Reference:

Building Scalable Cisco Networks (Ciscopress) page 471

Question: 2.

Which of the following AS numbers is an example of a private AS number?

A. 10080

B. 48512

C. 64128

D. 64524

Answer: D

Explanation:

This autonomous system designator is a 16-bit number, with a range of 1 to 65535. RFC 1930

provides guidelines for the use of AS numbers. A range of AS number, 64512 through 65535, is

reserved for private use, much like the private Internet Protocol (IP) addresses.

Reference:

Building Scalable Cisco Networks (Ciscopress) page 312

Question: 3.

Which command would display OSPF parameters such as filters, default metric, maximum paths,

and number of areas configured on a router?

A. show ip protocol

B. show ip route

C. show ip ospf interface

D. show ip ospf

E. show ip interface

F. None of the above

Answer: A

Explanation:

The "show ip protocol" command displays values about routing timers and network information

associated with the entire router. This includes, the AS number associated with the routing

process, number of areas configured on the router, the metric, and the maximum paths.

Question: 4.

Router ES1 has a 256kbps serial interface link to another Company location. The configuration

file of this interface is shown below:

interface serial 0/0

bandwidth 56

ip bandwidth-percent eigrp 1 200

From the command output above, how many kbps of bandwidth is allocated for EIGRP traffic?

A. 56 kbps

B. 112 kbps

C. 128 kbps

D. 256 kbps

Answer: B

Explanation:

The bandwidth-percent command tells EIGRP what percentage of the configured bandwidth it

may use. The default is 50 percent. Since the bandwidth command is also used to set the routing

protocol metric, it may be set to a particular value for policy reasons. In this case, it is set to 56

kbps even though the actual link is 256 kbps.

The bandwidth-percent command can have values greater than 100 if the bandwidth is

configured artificially low due to such policy reasons. In this specific case, the bandwidth

configured on the interface is 56kbps, so 200 percent of this value is 112 kbps.

Reference:

http://www.cisco.com/en/US/tech/tk365/tk207/technologies_tech_note09186a0080094063.shtml

Question: 5.

Cisco routers perform route summarization automatically for which three routing protocols?

(Choose three)

A. IS-IS

B. IGRP

C. OSPF

D. EIGRP

E. RIP v.2

Answer: B, D, E

Explanation:

Sending route summaries - Routing information advertised out an interface is automatically

summarized at major (classful) network address boundaries by RIP, IGRP, and EIGRP.

Specifically, this autonomous summarization occurs for those routes whose classful network

address differs from the major network address of the interface to which the advertisement is

being sent.

Reference:

Building Scalable Cisco Networks (Ciscopress) page 79

Question: 6.

While troubleshooting a BGP problem on the Company network you notice that the 10.10.10.0/24

prefix is not being injected into the local BGP table of ES1. The relevant configuration of router

ES1 is shown below:

router bgp 65001

network 10.0.0.0

neighbor 172.16.1.1 remote-as 65002

no auto-summary

Routing table information:

show ip route | include 10

O 10.10.10.0/24 [110/11] via 192.168.1.1, 2d00h, Ethernet0/0

Why doesn't the local BGP table have the prefix?

A. This route is not a BGP learned route.

B. The network command is wrong.

C. The 172.16.1.1 neighbor is down.

D. The prefix 10.10.10.0/24 is not a connected route.

Answer: B

Explanation:

The correct syntax should be "network 10.10.10.0 mask 255.255.255.0" under the BGP routing

process. Without the correct subnet mask specified, the route will not get injected into the BGP

routing table, even if it is learned via an IGP. In this case, the route is known via OSPF.

Question: 7.

Which command displays RIP routing transactions?

A. show ip rip database

B. show ip route

C. show ip protocols rip

D. debug ip rip

E. debug ip routing

Answer: D

Explanation:

debug ip rip

Use the debug ip rip EXEC command to display information on RIP routing transactions. The no

form of this command disables debugging output.

Reference:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_command_reference_chapte

r09186a008007ff66.html

Question: 8.

Exhibit:

What is the OSPF router ID for Company2 assuming the router-id command is not used?

A. 10.5.10.2

B. 10.7.0.3

C. 10.9.0.1

D. 10.12.10.10

Answer: D

Explanation:

The highest ip address on an active interface is normally used as the OSPF router ID. This can

be overridden by configuring an IP address on a loopback address on a loopback interface.

Reference:

Building Scalable Cisco Networks (Ciscopress) page 126

 

 

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