Download New Updated (July) Cisco 400-101 Actual Test 31-40

Ensurepass

 

QUESTION 31

DRAG DROP

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Correct Answer:

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QUESTION 32

DRAG DROP

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Correct Answer:

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QUESTION 33

Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.)

 

A.

the forwarding information base

B.

the label forwarding information base

C.

the IP routing table

D.

the label information table

E.

the adjacency table

 

Correct Answer: AB

Explanation:

The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and frames. The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding Information Base (FIB) is used for IP traffic and the Label FIB
is used for MPLS.

 

 

QUESTION 34

Which option is the most effective action to avoid packet loss due to microbursts?

 

A.

Implement larger buffers.

B.

Install a faster CPU.

C.

Install a faster network interface.

D.

Configure a larger tx-ring size.

 

Correct Answer: A

Explanation:

You can’t avoid or prevent them as such without modifying the sending host’s application/network stack so it smoothes out the bursts. However, you can manage microbursts by tuning the size of receive buffers / rings to absorb occasional microbursts.

 

 

QUESTION 35

Which two statements about packet fragmentation on an IPv6 network are true? (Choose two.)

 

A.

The fragment header is 64 bits long.

B.

The identification field is 32 bits long.

C.

The fragment header is 32 bits long.

D.

The identification field is 64 bits long.

E.

The MTU must be a minimum of 1280 bytes.

F.

The fragment header is 48 bits long.

 

Correct Answer: AB

Explanation:

The fragment header is shown below, being 64 bits total with a 32 bit identification field:

 

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Reference: http://www.openwall.com/presentations/IPv6/img24.html

 

 

QUESTION 36

You are backing up a server with a 1 Gbps link and a latency of 2 ms. Which two statements about the backup are true? (Choose two.)

 

A.

The bandwidth delay product is 2 Mb.

B.

The default TCP send window size is the limiting factor.

C.

The default TCP receive window size is the limiting factor.

D.

The bandwidth delay product is 500 Mb.

E.

The bandwidth delay product is 50 Mb.

 

Correct Answer: AC

Explanation:

1 Gbps is the same as 1000 Mbps, and 1000Mb x .0002 = 2 Mbps. With TCP based data transfers, the receive window is always the limiting factor, as the sender is generally able to send traffic at line rate, but then must wait for the acknowledgements to send more data.

 

QUESTION 37

Which two pieces of information does RTCP use to inform endpoint devices about the RTP flow? (Choose two.)

 

A.

the transmitted octet

B.

the lost packet count

C.

session control function provisioning information

D.

the CNAME for session participants

E.

the authentication method

F.

MTU size changes in the path of the flow

 

Correct Answer: AB

Explanation:

RTCP transports statistics for a media connection and information such as transmitted octet and packet counts, packet loss, packet delay variation, and round-trip delay time. An application may use this information to control quality of service parameters, perhaps by limiting flow, or using a different codec.

Reference: http://en.wikipedia.org/wiki/RTP_Control_Protocol

 

 

QUESTION 38

DRAG DROP

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Correct Answer:

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QUESTION 39

DRAG DROP

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Correct Answer:

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QUESTION 40

DRAG DROP

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Correct Answer:

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