Cisco 200-125 Online Practice Questions and Exam Preparation

Cisco 200-125 Online Questions & Answers

• Question 681:

  What is the effect of PortFast on the MAC aging process?

  A. It ignores the MAC aging timer when IEEE 802.1D is in use.
  B. It prevents fast aging of MAC addresses when IEEE 802.1D is in use.
  C. It prevents fast aging of MAC addresses when RSTP is in use.
  D. It ignores the MAC aging timer when RSTP is in use.
  B. It prevents fast aging of MAC addresses when IEEE 802.1D is in use.

• Question 682:

  Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?

  A. transport
  B. network
  C. presentation
  D. session
  E. application
  E. application

  ---

  This question is to examine the OSI reference model. The Application layer is responsible for identifying and establishing the availability of the intended communication partner and determining whether sufficient resources for the intended communication exist.

• Question 683:

  Which characteristics are representatives 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

  ---

  Each of routers running link-state routing protocol learns paths to all the destinations in its "area" so we can say although it is a bit unclear. Link-state routing protocols generate routing updates only (not the whole routing table) when a change

  occurs in the network topology so

  Link-state routing protocol like OSPF uses Dijkstra algorithm to calculate the shortest path - >.

  Unlike Distance vector routing protocol (which utilizes frequent periodic updates), link-state routing protocol utilizes event-triggered updates (only sends update when a change occurs) ->.

• Question 684:

  Refer to the exhibit.

  

  What is the most efficient summarization that R1 can use to advertise its networks to R2?

  A. 172.1.0.0/22
  B. 172.1.0.0/21
  C. 172.1.4.0/22
  D. 172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24
  E. 172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24
  C. 172.1.4.0/22

  ---

  The 172.1.4.0/22 subnet encompasses all routes from the IP range 172.1.4.0 ?172.1.7.255.

• Question 685:

  Which port state is introduced by Rapid-PVST?

  A. learning
  B. listening
  C. discarding
  D. forwarding
  C. discarding

  ---

  PVST+ is based on IEEE802.1D Spanning Tree Protocol (STP). But PVST+ has only 3 port states (discarding, learning and forwarding) while STP has 5 port states (blocking, listening, learning, forwarding and disabled). So discarding is a new port state in PVST+.

• Question 686:

  Which two options are fields in an ethernet frame ? choose two

  A. destination ip address
  B. source ip address
  C. type
  D. frame check sequence
  E. header
  C. type
  D. frame check sequence

• Question 687:

  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 688:

  When is a routing table entry identified as directly connected?

  A. when the local router is in use as the network default gateway
  B. when the network resides on a remote router that is physically connected to the local router
  C. when an interface on the route is configure with an ip address and enabled
  D. when the route is statically assigned to reach a specific network
  C. when an interface on the route is configure with an ip address and enabled

• Question 689:

  Which two benefits can you get by stacking Cisco switches?(Choose two)

  A. Each switch in the stack handles the MAC table independently from the others
  B. You can add or remove switches without taking the stack down.
  C. Each switch in the stack can use a different IOS image
  D. The stack enables any active member to take over as the master switch if the existing master fails.
  E. You can license the entire stack with a single master license
  B. You can add or remove switches without taking the stack down.
  D. The stack enables any active member to take over as the master switch if the existing master fails.

• Question 690:

  Which option is the main function of congestion management ?

  A. providing long term storage of buffered data
  B. queuing traffic based on priority
  C. discarding excess traffic
  D. classifying traffic
  B. queuing traffic based on priority