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Home Cisco® 400-101

Cisco® 400-101 Exam Practice Questions (P. 3)

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Question #21
DRAG DROP -
Drag and drop the extended ping command field on the left to its usage on the right.
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A.
B.
C.
D.

Correct Answer:
Explanation



Question #22
DRAG DROP -
Drag and drop the argument of the mls ip cef load-sharing command on the left to the function it performs on the right.

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A.
B.
C.
D.

Correct Answer:
Explanation



Question #23
Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.)
  1. A
    the forwarding information base
  2. B
    the label forwarding information base
  3. C
    the IP routing table
  4. D
    the label information table
  5. E
    the adjacency table

Correct Answer:
AB
The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so
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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 #24
Which option is the most effective action to avoid packet loss due to microbursts?
  1. A
    Implement larger buffers.
  2. B
    Install a faster CPU.
  3. C
    Install a faster network interface.
  4. D
    Configure a larger tx-ring size.

Correct Answer:
A
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 #25
Which two statements about packet fragmentation on an IPv6 network are true? (Choose two.)
  1. A
    The fragment header is 64 bits long.
  2. B
    The identification field is 32 bits long.
  3. C
    The fragment header is 32 bits long.
  4. D
    The identification field is 64 bits long.
  5. E
    The MTU must be a minimum of 1280 bytes.
  6. F
    The fragment header is 48 bits long.

Correct Answer:
AB
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 #26
How many hash buckets does Cisco Express Forwarding use for load balancing?
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  1. A
    8
  2. B
    16
  3. C
    24
  4. D
    32

Correct Answer:
B
In order to understand how the load balance takes place, you must first see how the tables relate. The Cisco Express Forwarding table points to 16 hash buckets
(load share table), which point to the adjacency table for parallel paths. Each packet to be switched is broken up into the source and destination address pair and checked against the loadshare table.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/18285-loadbal- cef.html

Question #27
Which three features require Cisco Express Forwarding? (Choose three.)
  1. A
    NBAR
  2. B
    AutoQoS
  3. C
    fragmentation
  4. D
    MPLS
  5. E
    UplinkFast
  6. F
    BackboneFast

Correct Answer:
ABD
QoS Features That Require CEF -
These class-based QoS features are supported only on routers that run CEF.
Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition.
The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For
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more information about this feature and its prerequisites, refer to AutoQoS - VoIP.
From MPLS Fundamentals - Luc De Ghein
Why Is CEF Needed in MPLS Networks?
Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router.
Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet
Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to- atm-class-of-service/4800-cefreq.html

Question #28
Which two options are interface requirements for turbo flooding? (Choose two.)
  1. A
    The interface is Ethernet.
  2. B
    The interface is configured for ARPA encapsulation.
  3. C
    The interface is PPP.
  4. D
    The interface is configured for GRE encapsulation.
  5. E
    The interface is configured for 802.1Q encapsulation.

Correct Answer:
AB
In the switch, the majority of packets are forwarded in hardware; most packets do not go through the switch CPU. For those packets that do go to the CPU, you can speed up spanning tree-based UDP flooding by a factor of about four to five times by using turbo-flooding. This feature is supported over Ethernet interfaces configured for ARPA encapsulation.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12- 2_50_se/configuration/guide/scg/swiprout.html

Question #29
Which three options are sub-subfields of the IPv4 Option Type subfield? (Choose three.)
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  1. A
    Option Class
  2. B
    GET
  3. C
    Copied
  4. D
    PUSH
  5. E
    Option Number
  6. F
    TTL

Correct Answer:
ACE
Each IP option has its own subfield format, generally structured as shown below. For most options, all three subfields are useD. Option Type, Option Length and
Option Data.

Reference: http://www.tcpipguide.com/free/t_IPDatagramOptionsandOptionFormat.htm

Question #30
Which TCP mechanism prevents the sender from sending data too quickly for the receiver to process?
  1. A
    Congestion control
  2. B
    Error detection
  3. C
    Selective acknowledgement
  4. D
    Flow control

Correct Answer:
D
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In data communications, flow control is the process of managing the rate of data transmission between two nodes to prevent a fast sender from overwhelming a slow receiver. It provides a mechanism for the receiver to control the transmission speed, so that the receiving node is not overwhelmed with data from transmitting node.
Reference: http://en.wikipedia.org/wiki/Flow_control_(data)

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