Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 111:

  Refer to the exhibit.

  

  Which two statements are true? (Choose two.)

  A. This router is not 4-byte autonomous system aware.
  B. This router is 4-byte autonomous system aware.
  C. The prefix 10.100.1.1/32 was learned through an autonomous system number with a length of 4 bytes, and this router is 4-byte autonomous system aware.
  D. The prefix 10.100.1.1/32 was learned through an autonomous system number with a length of 4 bytes, and this router is not 4-byte autonomous system aware.
  E. The prefix 10.100.1.1/32 was originated from a 4-byte autonomous system.
  A. This router is not 4-byte autonomous system aware.
  D. The prefix 10.100.1.1/32 was learned through an autonomous system number with a length of 4 bytes, and this router is not 4-byte autonomous system aware.

  ---

  Prior to January 2009, BGP autonomous system (AS) numbers that were allocated to companies were 2-octet numbers in the range from 1 to 65535 as described in RFC 4271, A Border Gateway Protocol 4 (BGP-4). Due to increased

  demand for AS numbers, the Internet Assigned Number Authority (IANA) started to allocate four-octet AS numbers in the range from 65536 to 4294967295. RFC 5396, Textual Representation of Autonomous System (AS) Numbers,

  documents three methods of representing AS numbers. Cisco has implemented the following two methods:

  Asplain -- Decimal value notation where both 2-byte and 4-byte AS numbers are represented by their decimal value. For example, 65526 is a 2-byte AS number and 234567 is a 4-byte AS number.

  Asdot -- Autonomous system dot notation where 2-byte AS numbers are represented by their decimal value and 4-byte AS numbers are represented by a dot notation. For example, 65526 is a 2-byte AS number and 1.169031 is a 4-byte AS

  number (this is dot notation for the 234567 decimal number).

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe- 3s/irg-xe-3s-book/irg-4byte-asn.html

• Question 112:

  Refer to the exhibit.

  

  Which two statements about how the configuration processes Telnet traffic are true? (Choose two.)

  A. Telnet traffic from 10.1.1.9 to 10.10.10.1 is dropped.
  B. All Telnet traffic is dropped.
  C. Telnet traffic from 10.10.10.1 to 10.1.1.9 is permitted.
  D. Telnet traffic from 10.1.1.9 to 10.10.10.1 is permitted.
  E. Telnet traffic is permitted to all IP addresses.
  A. Telnet traffic from 10.1.1.9 to 10.10.10.1 is dropped.
  C. Telnet traffic from 10.10.10.1 to 10.1.1.9 is permitted.

  ---

  The ACL applied to the COPP policy matches only telnet traffic from 10.1.1.9 to 10.10.10.1, all other telnet traffic is not matched and therefore not used in the COPP policy, which means this traffic will be handled normally (accepted). For telnet traffic from 10.1.1.9 to 10.10.10.1, the COPP policy has defined this traffic as an exceed, and dropped.

• Question 113:

  Refer to the exhibit.

  

  Routers R1, R2, and R3 are configured as shown, and traffic from R2 fails to reach 172.29.168.3. Which action can you take to correct the problem?

  A. Correct the static route on R1.
  B. Correct the default route on R2.
  C. Edit the EIGRP configuration of R3 to enable auto-summary.
  D. Correct the network statement for 172.29.168.3 on R3.
  A. Correct the static route on R1.

  ---

  On R1 we see there is a wrongly configured static route: ip route 172.29.168.3 255.255.255.255 172.17.17.2. It should be ip route 172.29.168.3 255.255.255.255 10.17.12.3.

• Question 114:

  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.

  Select and Place:

  

  

• Question 115:

  As a best practice, when a router is configured as an EIGRP Stub, which routes should be received from its distribution neighbor?

  A. the default route
  B. static routes
  C. internal routes only
  D. internal and external routes
  A. the default route

  ---

  Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke network, one or more end (stub) networks are connected to a remote router (the spoke) that is connected to one or more distribution routers (the hub). The remote router is adjacent only to one or more distribution routers. The only route for IP traffic to follow into the remote router is through a distribution router. This type of configuration is commonly used in WAN topologies where the distribution router is directly connected to a WAN. The distribution router can be connected to many more remote routers. Often, the distribution router will be connected to 100 or more remote routers. In a hub and spoke topology, the remote router must forward all nonlocal traffic to a distribution router, so it becomes unnecessary for the remote router to hold a complete routing table. Generally, the distribution router need not send anything more than a default route to the remote router.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/eigrpstb.html

• Question 116:

  Which statement about Cisco Discovery Protocol is true?

  A. The multicast address 0100.0cdd.dddd is used as the destination address for periodic advertisements.
  B. An inactive VLAN that is configured on an access port passes periodic Cisco Discovery Protocol advertisements.
  C. The multicast address 0100.0ccc.ccd is used as the destination address for periodic advertisements.
  D. A VLAN must be active on an access port before periodic Cisco Discovery Protocol advertisements are passed.
  D. A VLAN must be active on an access port before periodic Cisco Discovery Protocol advertisements are passed.

  ---

  All CDP packets include a VLAN ID. If you configure CDP on a Layer 2 access port, the CDP packets sent from that access port include the access port VLAN ID. If you configure CDP on a Layer 2 trunk port, the CDP packets sent from that trunk port include the lowest configured VLAN ID allowed on that trunk port. CDP messages on the active physical interfaces (Ethernet NIC) to a well-known multicast address (0100.0CCC.CCCC.

• Question 117:

  Which statement about the BGP synchronization rule is true?

  A. A BGP router with synchronization enabled does not advertise its iBGP learned routes to its iBGP peers unless it has learned or verified this route on its routing table through an IGP.
  B. A BGP router with synchronization enabled does not advertise its eBGP learned routes to its iBGP peers unless it has learned or verified this route on its routing table through an IGP.
  C. A BGP router with synchronization enabled does not advertise its eBGP learned routes to its eBGP peers unless it has learned or verified this route on its routing table through an IGP.
  D. A BGP router with synchronization enabled does not advertise its iBGP learned routes to its eBGP peers unless it has learned or verified this route on its routing table through an IGP.
  D. A BGP router with synchronization enabled does not advertise its iBGP learned routes to its eBGP peers unless it has learned or verified this route on its routing table through an IGP.

• Question 118:

  In a network where a Layer 2 switch interconnects several routers, which feature restricts multicast packets for each IP multicast group to only those mulicast router ports that have downstream receivers joined to that group?

  A. PIM snooping
  B. IGMP snooping
  C. IGMP filter
  D. IGMP proxy
  A. PIM snooping

  ---

  In networks where a Layer 2 switch interconnects several routers, such as an Internet exchange point (IXP), the switch floods IP multicast packets on all multicast router ports by default, even if there are no multicast receivers downstream. With PIM snooping enabled, the switch restricts multicast packets for each IP multicast group to only those multicast router ports that have downstream receivers joined to that group. When you enable PIM snooping, the switch learns which multicast router ports need to receive the multicast traffic within a specific VLAN by listening to the PIM hello messages, PIM join and prune messages, and bidirectional PIM designated forwarder-election messages.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/snooppim.html

• Question 119:

  Which three statements about the designated router election in IS-IS are true? (Choose three.)

  A. If the IS-IS DR fails, a new DR is elected.
  B. The IS-IS DR will preempt. If a new router with better priority is added, it just becomes active in the network.
  C. If there is a tie in DR priority, the router with a higher IP address wins.
  D. If there is a tie in DR priority, the router with a higher MAC address wins.
  E. If the DR fails, the BDR is promoted as the DR.
  F. The DR is optional in a point-to-point network.
  A. If the IS-IS DR fails, a new DR is elected.
  B. The IS-IS DR will preempt. If a new router with better priority is added, it just becomes active in the network.
  D. If there is a tie in DR priority, the router with a higher MAC address wins.

  ---

  DR/DIS election

  highest priority (0-127)

  highest mac address

  Setting priority to 0 doesn't disable DIS election; use point-to-point to disable it. There can be separate DRs for L1 and L2 adjacencies. There is no backup DR. If the primary DR fails, a new DR is elected.

  DR preemption is enabled by default.

  Reference: http://ccie-in-2-months.blogspot.com/2013/12/is-is-hints.html

• Question 120:

  Which two statements about Cisco IOS software and Cisco IOS-XE software are true? (Choose two)

  A. The process IOSd on Cisco IOS-XE software runs all routing protocols.
  B. Cisco IOS-XE software is based on a monolithic architecture.
  C. Cisco IOS software allows processes to use different CPU cores.
  D. Cisco IOS-XE software uses a hardened BSD version as the base OS.
  E. Cisco IOS-XE software utilizes a separate control and forwarding plane.
  A. The process IOSd on Cisco IOS-XE software runs all routing protocols.
  E. Cisco IOS-XE software utilizes a separate control and forwarding plane.