Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 1:

  Which three characteristics are representative of a link-state routing protocol? (Choose three.)

  A. provides common view of entire topology
  B. exchanges routing tables with neighbors
  C. calculates shortest path
  D. utilizes event-triggered updates
  E. utilizes frequent periodic updates
  A. provides common view of entire topology
  C. calculates shortest path
  D. utilizes event-triggered updates

• Question 2:

  Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?

  A. BackboneFast
  B. UplinkFast
  C. Root Guard
  D. BPDU Guard
  E. BPDU Filter
  D. BPDU Guard

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  We only enable PortFast feature on access ports (ports connected to end stations). But if someone does not know he can accidentally plug that port to another switch and a loop may occur when BPDUs are being transmitted and received on

  these ports.

  With BPDU Guard, when a PortFast receives a BPDU, it will be shut down to prevent a loop.

• Question 3:

  Refer to the exhibit.

  

  What statement is true of the configuration for this network?

  A. The configuration that is shown provides inadequate outside address space for translation of the number of inside addresses that are supported.
  B. Because of the addressing on interface FastEthernet0/1, the Serial0/0 interface address will not support the NAT configuration as shown.
  C. The number 1 referred to in the ip nat inside source command references access-list number 1.
  D. ExternalRouter must be configured with static routes to networks 172.16.1.0/24 and 172.16.2.0/24.
  C. The number 1 referred to in the ip nat inside source command references access-list number 1.

  ---

  The "list 1 refers to the access-list number 1.

• Question 4:

  Refer to the exhibit.

  

  A frame on VLAN 1 on switch S1 is sent to switch S2 where the frame is received on VLAN 2. What causes this behavior?

  A. trunk mode mismatches
  B. allowing only VLAN 2 on the destination
  C. native VLAN mismatches
  D. VLANs that do not correspond to a unique IP subnet
  C. native VLAN mismatches

  ---

  Untagged frames are encapsulated with the native VLAN. In this case, the native VLANs are different so although S1 will tag it as VLAN 1 it will be received by S2.

• Question 5:

  Which condition indicates that service password-encryption is enabled?

  A. The local username password is encrypted in the configuration.
  B. The enable secret is encrypted in the configuration.
  C. The local username password is in clear text in the configuration.
  D. The enable secret is in clear text in the configuration.
  A. The local username password is encrypted in the configuration.

• Question 6:

  In a switched environment, what does the IEEE 802.1Q standard describe?

  A. the operation of VTP
  B. a method of VLAN trunking
  C. an approach to wireless LAN communication
  D. the process for root bridge selection
  E. VLAN pruning
  B. a method of VLAN trunking

  ---

  A broadcast domain must sometimes exist on more than one switch in the network. To accomplish this, one switch must send frames to another switch and indicate which VLAN a particular frame belongs to. On Cisco switches, a trunk link is created to accomplish this VLAN identification. ISL and IEEE 802.1Q are different methods of putting a VLAN identifier in a Layer 2 frame. The IEEE 802.1Q protocol interconnects VLANs between multiple switches, routers, and servers. With 802.1Q, a network administrator can define a VLAN topology to span multiple physical devices. Cisco switches support IEEE 802.1Q for FastEthernet and Gigabit Ethernet interfaces. An 802.1Q trunk link provides VLAN identification by adding a 4-byte tag to an Ethernet Frame as it leaves a trunk port.

• Question 7:

  The network administrator is asked to configure 113 point-to-point links. Which IP addressing scheme defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?

  A. 10.10.0.0/16 subnetted with mask 255.255.255.252
  B. 10.10.0.0/18 subnetted with mask 255.255.255.252
  C. 10.10.1.0/24 subnetted with mask 255.255.255.252
  D. 10.10.0.0/23 subnetted with mask 255.255.255.252
  E. 10.10.1.0/25 subnetted with mask 255.255.255.252
  D. 10.10.0.0/23 subnetted with mask 255.255.255.252

  ---

  We need 113 point-to-point links which equal to 113 sub-networks < 128 so we need to borrow 7 bits (because 2^7 = 128).

  The network used for point-to-point connection should be /30.

  So our initial network should be 30 ?7 = 23.

  So 10.10.0.0/23 is the correct answer.

  You can understand it more clearly when writing it in binary form:

  /23 = 1111 1111.1111 1110.0000 0000

  /30 = 1111 1111.1111 1111.1111 1100 (borrow 7 bits)

• Question 8:

  What are three reasons to collect Netflow data on a company network? (Choose three.)

  A. To identify applications causing congestion.
  B. To authorize user network access.
  C. To report and alert link up / down instances.
  D. To diagnose slow network performance, bandwidth hogs, and bandwidth utilization.
  E. To detect suboptimal routing in the network.
  F. To confirm the appropriate amount of bandwidth that has been allocated to each Class of Service.
  A. To identify applications causing congestion.
  D. To diagnose slow network performance, bandwidth hogs, and bandwidth utilization.
  F. To confirm the appropriate amount of bandwidth that has been allocated to each Class of Service.

  ---

  NetFlow facilitates solutions to many common problems encountered by IT professionals.

  +

  Analyze new applications and their network impact

  Identify new application network loads such as VoIP or remote site additions.

  +

  Reduction in peak WAN traffic

  Use NetFlow statistics to measure WAN traffic improvement from application-policy changes; understand who is utilizing the network and the network top talkers.

  +

  Troubleshooting and understanding network pain points

  Diagnose slow network performance, bandwidth hogs and bandwidth utilization quickly with command line interface or reporting tools. -> D is correct.

  +

  Detection of unauthorized WAN traffic

  Avoid costly upgrades by identifying the applications causing congestion. -> A is correct.

  +

  Security and anomaly detection

  NetFlow can be used for anomaly detection and worm diagnosis along with applications such as Cisco CS-Mars.

  +

  Validation of QoS parameters

  Confirm that appropriate bandwidth has been allocated to each Class of Service (CoS) and that no CoS is over- or under-subscribed.-> F is correct.

• Question 9:

  What two things will a router do when running a distance vector routing protocol? (Choose two.)

  A. Send periodic updates regardless of topology changes.
  B. Send entire routing table to all routers in the routing domain.
  C. Use the shortest-path algorithm to the determine best path.
  D. Update the routing table based on updates from their neighbors.
  E. Maintain the topology of the entire network in its database.
  A. Send periodic updates regardless of topology changes.
  D. Update the routing table based on updates from their neighbors.

  ---

  Distance means how far and Vector means in which direction. Distance Vector routing protocols pass periodic copies of routing table to neighbor routers and accumulate distance vectors. In distance vector routing protocols, routers discover the best path to destination from each neighbor. The routing updates proceed step by step from router to router.

• Question 10:

  Assuming the default switch configuration, which VLAN range can be added, modified, and removed on a Cisco switch?

  A. 1 through 1001
  B. 2 through 1001
  C. 1 through 1002
  D. 2 through 1005
  B. 2 through 1001

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  VLAN 1 is the default VLAN on Cisco switch. It always exists and cannot be added, modified or removed. VLANs 1002-1005 are default VLANs for FDDI and Token Ring and they can't be deleted or used for Ethernet.