Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 881:

  Refer to the exhibit.

  

  You must complete the configuration on R1 so that a maximum of three links can be used and fragmentation is supported.

  Which additional configuration accomplishes this task?

  A. interface Multilink19 ip address 192.168.1.1 255.255.255.0 ppp multilink ppp multilink group 19 ppp multilink links minimum 1 ppp multilink links maximum 3 ppp multilink interleave
  B. interface Multilink19 ip address 192.168.1.1 255.255.255.0 ppp multilink ppp multilink group 19 ppp multilink links maximum 3 ppp multilink fragment delay 20
  C. interface Multilink19 ip address 192.168.1.1 255.255.255.0 ppp multilink ppp multilink group 19 ppp multilink links maximum 3 ppp multilink fragment delay 20 ppp multilink interleave
  D. interface Multilink19 ip address 192.168.1.1 255.255.255.252 ppp multilink ppp multilink group 19 ppp multilink links maximum 3 ppp multilink interleave
  A. interface Multilink19 ip address 192.168.1.1 255.255.255.0 ppp multilink ppp multilink group 19 ppp multilink links minimum 1 ppp multilink links maximum 3 ppp multilink interleave

  ---

  The "ppp multilink interleave" command is needed to enable link fragmentation and Interleaving (LFI). The Cisco IOS Link Fragmentation and Interleaving (LFI) feature uses Multilink PPP (MLP). MLP provides a method of splitting,

  recombining, and sequencing datagrams across multiple logical data links. MLP allows packets to be fragmented and the fragments to be sent at the same time over multiple point-to-point links to the same remote address.

  ppp multilink links maximum

  To limit the maximum number of links that Multilink PPP (MLP) can dial for dynamic allocation, use the ppp multilink links maximum command in interface configuration mode.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcflfi.html

• Question 882:

  When you implement PfR, which IP SLA probe is used to determine the MOS?

  A. jitter
  B. latency
  C. packet loss
  D. throughput
  A. jitter

• Question 883:

  DRAG DROP

  Drag each OSPF route-type identifier on the left to its description on the right.

  Select and Place:

  

  

• Question 884:

  Assume that the following MAC addresses are used for the bridge ID MAC address by four different switches in a network. Which switch will be elected as the spanning-tree root bridge?

  A. SwitchA uses MAC 1000.AA-AA-AA-AA-AA-AA.
  B. SwitchB uses MAC 2000.BB-BB-BB-BB-BB-BB.
  C. SwitchC uses MAC 3000.CC-CC-CC-CC-CC-CC.
  D. SwitchD uses MAC 4000.DD-DD-DD-DD-DD-DD.
  A. SwitchA uses MAC 1000.AA-AA-AA-AA-AA-AA.

  ---

  The switch with the highest switch priority (the lowest numerical priority value) is elected as the root switch. If all switches are configured with the default priority (32768), the switch with the lowest MAC address in the VLAN becomes the root

  switch.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12- 2_53_se/configuration/guide/2960scg/swstp.html

• Question 885:

  Refer to the exhibit.

  

  Your network is suffering excessive output drops. Which two actions can you take to resolve the problem? (Choose two.)

  A. Install a switch with larger buffers.
  B. Configure a different queue set.
  C. Reconfigure the switch buffers.
  D. Configure the server application to use TCP.
  E. Update the server operating system.
  A. Install a switch with larger buffers.
  B. Configure a different queue set.

  ---

  Installing a switch with larger buffers and correctly configuring the buffers can solve output queue problems. For each queue we need to configure the assigned buffers. The buffer is like the `storage' space for the interface and we have to

  divide it among the different queues. This is how to do it:

  mls qos queue-set output buffers Q1 Q2 Q3 Q4 In this example, there is nothing hitting queue 2 or queue 3 so they are not being utilized.

• Question 886:

  Which three options are sub-subfields of the IPv4 Option Type subfield? (Choose three.)

  A. Option Class
  B. GET
  C. Copied
  D. PUSH
  E. Option Number
  F. TTL
  A. Option Class
  C. Copied
  E. Option Number

  ---

  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 887:

  Which two mechanisms provide Cisco IOS XE Software with control plane and data plane separation? (Choose two.)

  A. Forwarding and Feature Manager
  B. Forwarding Engine Driver
  C. Forwarding Performance Management
  D. Forwarding Information Base
  A. Forwarding and Feature Manager
  B. Forwarding Engine Driver

  ---

  Control Plane and Data Plane Separation IOS XE introduces an opportunity to enable teams to now build drivers for new Data Plane ASICs outside the IOS instance and have them program to a set of standard APIs which in turn enforces Control Plane and Data Plane processing separation. IOS XE accomplishes Control Plane / Data Plane separation through the introduction of the Forwarding and Feature Manager (FFM) and its standard interface to the Forwarding Engine Driver (FED). FFM provides a set of APIs to Control Plane processes. In turn, the FFM programs the Data Plane via the FED and maintains forwarding state for the system. The FED is the instantiation of the hardware driver for the Data Plane and is provided by the platform.

  Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-xe- 3sg/QA_C67-622903.html

• Question 888:

  Which two BGP attributes are optional, non-transitive attributes? (Choose two.)

  A. AS path
  B. local preference
  C. MED
  D. weight E. cluster list
  C. MED

• Question 889:

  What is the main component of Unified MPLS?

  A. Multiple IGPs in the network are used, where the loopback IP addresses of the PE routers are aggregated on the area border routers.
  B. Confederations are used to provide scalability.
  C. The loopback prefixes from one IGP area are redistributed into BGP without changing the next hop.
  D. The ABR is a BGP route reflector and sets next-hop to self for all reflected routes.
  D. The ABR is a BGP route reflector and sets next-hop to self for all reflected routes.

  ---

  Since the core and aggregation parts of the network are integrated and end-to-end LSPs are provided, the Unified MPLS solution is also referred to as "Seamless MPLS." New technologies or protocols are not used here, only MPLS, Label Distribution Protocol (LDP), IGP, and BGP. Since you do not want to distribute the loopback prefixes of the PE routers from one part of the network into another part, you need to carry the prefixes in BGP. The Internal Border Gateway Protocol (iBGP) is used in one network, so the next hop address of the prefixes is the loopback prefixes of the PE routers, which is not known by the IGP in the other parts of the network. This means that the next hop address cannot be used to recurse to an IGP prefix. The trick is to make the ABR routers Route Reflectors (RR) and set the next hop to self, even for the reflected iBGP prefixes. In order for this to work, a new knob is needed.

  Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching- mpls/mpls/116127-configure-technology-00.html

• Question 890:

  Refer to the exhibit.

  

  Which two are causes of output queue drops on FastEthernet0/0? (Choose two.)

  A. an oversubscribed input service policy on FastEthernet0/0
  B. a duplex mismatch on FastEthernet0/0
  C. a bad cable connected to FastEthernet0/0
  D. an oversubscribed output service policy on FastEthernet0/0
  E. The router trying to send more than 100 Mb/s out of FastEthernet0/0
  D. an oversubscribed output service policy on FastEthernet0/0
  E. The router trying to send more than 100 Mb/s out of FastEthernet0/0

  ---

  Output drops are caused by a congested interface. For example, the traffic rate on the outgoing interface cannot accept all packets that should be sent out, or a service policy is applied that is oversubscribed. The ultimate solution to resolve the problem is to increase the line speed. However, there are ways to prevent, decrease, or control output drops when you do not want to increase the line speed. You can prevent output drops only if output drops are a consequence of short bursts of data. If output drops are caused by a constant high-rate flow, you cannot prevent the drops. However, you can control them.

  Reference: http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/6343- queue-drops.html