Cisco CCNA 200-301 Questions & Answers

• Question 1261:

  Refer to the exhibit.

  

  If OSPF is running on this network, how does Router 2 handle traffic from Site B to 10.10.13/25 at Site A?

  A. It sends packets out of interface Fa0/1 only.

  B. It sends packets out of interface Fa0/2 only.

  C. It load-balances traffic out of Fa0/1 and Fa0/2.

  D. It cannot send packets to 10.10.13.128/25.

  Correct Answer: D

  Router2 does not have an entry for the subnet 10.10.13.128/25. It only has an entry for 10.10.13.0/25, which ranges from 10.10.13.0 to 10.10.13.127

• Question 1262:

  Which attribute does a router use to select the best path when two or more different routes to the same destination exist from two different routing protocols?

  A. dual algorithm

  B. metric

  C. administrative distance

  D. hop count

  Correct Answer: C

  Administrative distance is the feature used by routers to select the best path when there are two or more different routes to the same destination from different routing protocols. Administrative distance defines the reliability of a routing protocol.

• Question 1263:

  Router A learns the same route from two different neighbors; one of the neighbor routers is an OSPF neighbor, and the other is an EIGRP neighbor. What is the administrative distance of the route that will be installed in the routing table?

  A. 20

  B. 90

  C. 110

  D. 115

  Correct Answer: B

  The Administrative distance (AD) of EIGRP is 90 while the AD of OSPF is 110 so EIGRP route will be chosen to install into the routing table.

• Question 1264:

  Refer to the exhibit.

  

  An engineer is bringing up a new circuit to the MPLS provider on the Gi0/1 interface of Router 1. The new circuit uses eBGP and learns the route to VLAN25 from the BGP path. What is the expected behavior for the traffic flow for route 10.10.13.0/25?

  A. Traffic to 10.10.13.0/25 is load balanced out of multiple interfaces.

  B. Traffic to 10.10.13.0/25 is asymmetrical.

  C. Route 10.10.13.0/25 is updated in the routing table as being learned from interface Gi0/1.

  D. Route 10.10.13.0/25 learned via the Gi0/0 interface remains in the routing table.

  Correct Answer: C

• Question 1265:

  Which two actions influence the EIGRP route selection process? (Choose two.)

  A. The advertised distance is calculated by a downstream neighbor to inform the local router of the bandwidth on the link.

  B. The router calculates the feasible distance of all paths to the destination route.

  C. The router must use the advertised distance as the metric for any given route.

  D. The router calculates the best backup path to the destination route and assigns it as the feasible successor.

  E. The router calculates the reported distance by multiplying the delay on the exiting interface by 256.

  Correct Answer: BD

  The reported distance (or advertised distance) is the cost from the neighbor to the destination. It is calculated from the router advertising the route to the network. For example in the topology below, suppose router A and B are exchanging their routing tables for the first time. Router B says “Hey, the best metric (cost) from me to IOWA is 50 and the metric from you to IOWA is 90” and advertises it to router A. Router A considers the first metric (50) as the Advertised distance. The second metric (90), which is from NEVADA to IOWA (through IDAHO), is called the Feasible distance.

  

  The reported distance is calculated in the same way of calculating the metric. By default (K1 = 1, K2 = 0, K3 = 1, K4 = 0, K5 = 0), the metric is calculated as follows:

  

  Feasible successor is the backup route. To be a feasible successor, the route must have an Advertised distance (AD) less than the Feasible distance (FD) of the current successor route.

  Feasible distance (FD): The sum of the AD plus the cost between the local router and the next-hop router. The router must calculate the FD of all paths to choose the best path to put into the routing table.

  Note: Although the new CCNA exam does not have EIGRP topic but you should learn the basic knowledge of this routing protocol.

• Question 1266:

  When OSPF learns multiple paths to a network, how does it select a route?

  A. For each existing interface, it adds the metric from the source router to the destination to calculate the route with the lowest bandwidth.

  B. It counts the number of hops between the source router and the destination to determine the route with the lowest metric.

  C. It divides a reference bandwidth of 100 Mbps by the actual bandwidth of the exiting interface to calculate the route with the lowest cost.

  D. It multiples the active K values by 256 to calculate the route with the lowest metric.

  Correct Answer: C

• Question 1267:

  When a floating static route is configured, which action ensures that the backup route is used when the primary route fails?

  A. The administrative distance must be higher on the primary route so that the backup route becomes secondary.

  B. The default-information originate command must be configured for the route to be installed into the routing table.

  C. The floating static route must have a lower administrative distance that the primary route so it is used as a backup.

  D. The floating static route must have a higher administrative distance that the primary route so it is used as a backup

  Correct Answer: D

• Question 1268:

  Refer to the exhibit.

  

  The show ip ospf interface command has been executed on R1. How is OSPF configured?

  A. A point-to-point network type is configured.

  B. The interface is not participating in OSPF.

  C. The default Hello and Dead timers are in use.

  D. There are six OSPF neighbors on this interface.

  Correct Answer: C

  From the output we can see there are Designated Router and Backup Designated Router for this OSPF domain so this is a broadcast network (point-to-point and point-to-multipoint networks do not elect DR and BDR).

  By default, the timers on a broadcast network (Ethernet, point-to-point and point-to-multipoint) are 10 seconds hello and 40 seconds dead. The timers on a non-broadcast network are 30 seconds hello 120 seconds dead.

  From the line “Neighbor Count is 3”, we learn there are four OSPF routers in this OSPF domain.

  Reference: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13689-17.html

• Question 1269:

  Refer to the exhibit.

  

  What does router R1 use as its OSPF router-ID?

  A. 10.10.1.10

  B. 10.10.10.20

  C. 172.16.15.10

  D. 192.168.0.1

  Correct Answer: C

  OSPF uses the following criteria to select the router ID:

  1.

  Manual configuration of the router ID (via the “router-id x.x.x.x” command under OSPF router configuration mode).

  2.

  Highest IP address on a loopback interface.

  3.

  Highest IP address on a non-loopback and active (no shutdown) interface.

• Question 1270:

  A user configured OSPF and advertised the Gigabit Ethernet interface in OSPF. By default, which type of OSPF network does this interface belong to?

  A. point-to-multipoint

  B. point-to-point

  C. broadcast

  D. nonbroadcast

  Correct Answer: C

  The Broadcast network type is the default for an OSPF enabled ethernet interface (while Point-to-Point is the default OSPF network type for Serial interface with HDLC and PPP encapsulation). Reference: https://www.oreilly.com/library/view/cisco-ios-cookbook/0596527225/ch08s15.html