Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 721:

  A network engineer is extending a LAN segment between two geographically separated data centers. Which enhancement to a spanning-tree design prevents unnecessary traffic from crossing the extended LAN segment?

  A. Modify the spanning-tree priorities to dictate the traffic flow.
  B. Create a Layer 3 transit VLAN to segment the traffic between the sites.
  C. Use VTP pruning on the trunk interfaces.
  D. Configure manual trunk pruning between the two locations.
  C. Use VTP pruning on the trunk interfaces.

• Question 722:

  How is traffic directed to a 6RD tunnel interface from the native IPv6 Internet?

  A. Traffic is routed to the 6RD gateway of the ISP and encapsulated over IPv4 to the tunnel interface.
  B. Traffic is sent encapsulated in IPv4 from the native IPv6 host directly to the tunnel interface.
  C. Traffic is routed to the nearest public gateway and encapsulated over IPv4 to the tunnel interface.
  D. Traffic is routed to the nearest public relay and encapsulated over IPv4 to the tunnel interface.
  C. Traffic is routed to the nearest public gateway and encapsulated over IPv4 to the tunnel interface.

• Question 723:

  How many bytes comprise the system ID within an IS-IS NET?

  A. 4 bytes
  B. 6 bytes
  C. 8 bytes
  D. 16 bytes
  E. 20 bytes
  B. 6 bytes

  ---

  Routers are identified with NETs of 8 to 20 bytes. ISO/IEC 10589 distinguishes only three fields in the NSAP address format: a variable-length area address beginning with a single octet, a system ID, and a 1-byte n-selector. Cisco implements a fixed length of 6 bytes for the system ID, which is like the OSPF router ID.

  Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml

• Question 724:

  Which EIGRP packet types are sent as unicast packets?

  A. hello, update, query
  B. query, SIA query, reply
  C. SIA query, reply, ACK
  D. query, SIA query, SIA reply
  C. SIA query, reply, ACK

• Question 725:

  Which three parameters must match to establish OSPF neighbor adjacency? (Choose three.)

  A. the process ID
  B. the hello interval
  C. the subnet mask
  D. authentication
  E. the router ID
  F. the OSPF interface priority
  B. the hello interval
  C. the subnet mask
  D. authentication

• Question 726:

  Which three features require Cisco Express Forwarding? (Choose three.)

  A. NBAR
  B. AutoQoS
  C. fragmentation
  D. MPLS
  E. UplinkFast
  F. BackboneFast
  A. NBAR
  B. AutoQoS
  D. MPLS

  ---

  QoS Features That Require CEF

  These class-based QoS features are supported only on routers that run CEF.

  etwork 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 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 727:

  Which two statements about RIPng are true? (Choose two.)

  A. IPv6 can support as many as 8 equal-cost routes.
  B. IPv6 can support as many as 32 equal-cost routes.
  C. A route with a metric of 15 is advertised as unreachable.
  D. Both inbound and outbound route filtering can be implemented on a single interface.
  E. 16 is the maximum metric it can advertise.
  D. Both inbound and outbound route filtering can be implemented on a single interface.
  E. 16 is the maximum metric it can advertise.

• Question 728:

  Which three steps are necessary to enable SSH? (Choose three.)

  A. generating an RSA or DSA cryptographic key
  B. configuring the version of SSH
  C. configuring a domain name
  D. configuring VTY lines for use with SSH
  E. configuring the port for SSH to listen for connections
  F. generating an AES or SHA cryptographic key
  A. generating an RSA or DSA cryptographic key
  C. configuring a domain name
  D. configuring VTY lines for use with SSH

  ---

  Here are the steps:

  1.

  Configure a hostname for the router using these commands.

  yourname#configure terminal

  Enter configuration commands, one per line. End with CNTL/Z.

  yourname (config)#hostname LabRouter

  LabRouter(config)#

  2.

  Configure a domain name with the ip domain-name command followed by whatever you would like your domain name to be. I used CiscoLab.com.

  LabRouter(config)#ip domain-name CiscoLab.com

  3.

  We generate a certificate that will be used to encrypt the SSH packets using the crypto key generate rsa command. Take note of the message that is displayed right after we enter this command. "The name for the keys will bE.

  LabRouter.CiscoLab.com" -- it combines the hostname of the router along with the domain name we configured to get the name of the encryption key generated; this is why it was important for us to, first of all, configure a hostname then a

  domain name before we generated the keys.

  Notice also that it asks us to choose a size of modulus for the key we're about to generate. The higher the modulus, the stronger the encryption of the key. For our example, we'll use a modulus of 1024.

  4.

  Now that we've generated the key, our next step would be to configure our vty lines for SSH access and specify which database we are going to use to provide authentication to the device. The local database on the router will do just fine for this example. LabRouter(config)#line vty 0 4 LabRouter(config-line)#login local LabRouter(config-line)#transport input ssh

  5.

  You will need to create an account on the local router's database to be used for authenticating to the device. This can be accomplished with these commands. LabRouter(config)#username XXXX privilege 15 secret XXXX

  

  Reference: http://blog.pluralsight.com/configure-secure-shell-ssh-on-cisco-router

• Question 729:

  What is a reason for an EIGRP router to send an SIA reply to a peer?

  A. to respond to an SIA query with the alternative path requested
  B. to respond to a query reporting that the prefix has gone stuck-in-active
  C. to respond to an SIA query that the router is still waiting on replies from its peers
  D. to respond to a reply reporting that the prefix has gone stuck-in-active
  C. to respond to an SIA query that the router is still waiting on replies from its peers

• Question 730:

  Which two configuration options are available for PIM snooping? (Choose two)

  A. on a specific interface on the device
  B. under the SVI for the corresponding VLAN
  C. on a range of interfaces on the device
  D. under the VLAN in VLAN configuration mode
  E. globally on the device
  B. under the SVI for the corresponding VLAN
  E. globally on the device