200-301 practice questions 641–650

1. Question 641 · 1334 in bank

   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?

   • Adual algorithm
   • Bmetric
   • Cadministrative distance
   • Dhop count

   Show answer

   Answer: C

   Explanation

   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.

   Source: Adapted from community discussion — alexiro

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2. Question 642 · 1334 in bank

   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?

   • A20
   • B90
   • C110
   • D115

   Show answer

   Answer: B

   Explanation

   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.

   Source: Adapted from community discussion — alexiro

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3. Question 643 · 1334 in bank

   

   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?

   • ATraffic to 10.10.13.0/25 is load balanced out of multiple interfaces.
   • BTraffic to 10.10.13.0/25 is asymmetrical.
   • CRoute 10.10.13.0/25 is updated in the routing table as being learned from interface Gi0/1.
   • DRoute 10.10.13.0/25 learned via the Gi0/0 interface remains in the routing table.

   Show answer

   Answer: C

   Explanation

   The correct answer is D Because when new route is learned by R1 it will be added to it's routing table via Gi0/1 But the previous still stays in the routing table which is learned via Gi0/0 (ospf) Hence we have two paths to reach 10.10.13.0/25 Cisco plays with words, read carefully. C is wrong because they used the word updated and not added. Updated means previous route is removed Which is not true , it stays in the table Hence D is perfect answer

   Source: Adapted from community discussion — cybernett

   References

   • Cisco documentation
   • Cisco documentation

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4. Question 644 · 1334 in bank

   Select 2

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

   • AThe advertised distance is calculated by a downstream neighbor to inform the local router of the bandwidth on the link.
   • BThe router calculates the feasible distance of all paths to the destination route.
   • CThe router must use the advertised distance as the metric for any given route.
   • DThe router calculates the best backup path to the destination route and assigns it as the feasible successor.
   • EThe router calculates the reported distance by multiplying the delay on the exiting interface by 256.

   Show answer

   Answer: BD

   Explanation

   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 & B are exchanging their routing tables for the first time. Router B says ג€Hey, the best metric (cost) from me to IOWA is 50 and the metric from you to IOWA is 90ג€ 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.

   Source: Adapted from community discussion — [Removed]

   

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5. Question 645 · 1334 in bank

   

   Refer to the exhibit. If OSPF is running on this network, how does Router2 handle traffic from Site B to 10.10.13.128/25 at Site A?

   • AIt sends packets out of interface Fa0/1 only.
   • BIt sends packets out of interface Fa0/2 only.
   • CIt load-balances traffic out of Fa0/1 and Fa0/2.
   • DIt cannot send packets to 10.10.13.128/25.

   Show answer

   Answer: D

   Explanation

   @ Texter: Router 2 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. You're welcome - Je vous en prie

   Source: Adapted from community discussion — admin1982

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6. Question 646 · 1334 in bank

   Select 2

   Which two outcomes are predictable behaviors for HSRP? (Choose two.)

   • AThe two routers negotiate one router as the active router and the other as the standby router.
   • BThe two routers share the same interface IP address, and default gateway traffic is load-balanced between them.
   • CThe two routers synchronize configurations to provide consistent packet forwarding.
   • DEach router has a different IP address, both routers act as the default gateway on the LAN, and traffic is load-balanced between them.
   • EThe two routers share a virtual IP address that is used as the default gateway for devices on the LAN.

   Show answer

   Answer: AE

   Explanation

   Hot Standby Router Protocol (HSRP) A Cisco proprietary protocol that allows two (or more) routers to share the duties of being the default router on a subnet, with an active/standby model, with one router acting as the default router and the other sitting by waiting to take over that role if the first router fails HSRP Protocol Cisco proprietary "Number of groups" 16 groups maximum Active/Standby "1 active, 1 standby and multiple candidates." "Virtual IPAddress" "Different from real IP addresses on interfaces" Multicast address 224.0.0.2 Tracking Interfaces or Objects HSRP virtual Mac address will start with 0000.0c07.acXX 07.ac is the hexadecimal conversion of the HSRP group Id. XX is Group number virtual Mac for hsrp group 2 = 0000.0c07.ac02 virtual Mac for hsrp group12 = 0000.0c07.ac0C

   Source: Adapted from community discussion — alexiro

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7. Question 647 · 1334 in bank

   An office has 8 floors with approximately 30-40 users per floor. One subnet must be used. Which command must be configured on the router Switched Virtual Interface to use address space efficiently?

   • Aip address 192.168.0.0 255.255.0.0
   • Bip address 192.168.0.0 255.255.254.0
   • Cip address 192.168.0.0 255.255.255.128
   • Dip address 192.168.0.0 255.255.255.224

   Show answer

   Answer: B

   Explanation

   8 floors and 40 user per floor means 320 users (approx.). How many bits do you need to have 320 IP addresses? 8 bits = (2^8 – 2) =254 IP addresses, and it’s not enough. 9 bits = (2^9 – 2) = 510 IP addresses, and this is enough. You have a class C subnet (192.168.0.0). This means a subnet mask like this: 255.255.255.0 But you need 9 bits for the hosts, so you’ve got left with a subnet mask like this: 255.255.1111111x.xxxxxxxx =255.255.254.0 This means you will use VLSM subnetting. Answer B is correct.

   Source: Adapted from community discussion — [Removed]

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8. Question 648 · 1334 in bank

   Select 2

   

   Refer to the exhibit. An engineer is configuring the New York router to reach the Lo1 interface of the Atlanta router using interface Se0/0/0 as the primary path. Which two commands must be configured on the New York router so that it reaches the Lo1 interface of the Atlanta router via Washington when the link between New York and Atlanta goes down? (Choose two.)

   • AIpv6 route 2000::1/128 2012::1
   • BIpv6 route 2000::1/128 2012::1 5
   • CIpv6 route 2000::1/128 2012::2
   • DIpv6 route 2000::1/128 2023::2 5
   • EIpv6 route 2000::1/128 2023::3 5

   Show answer

   Answer: AE

   Explanation

   I agree with Jeff, the question is not correctly worded. I also assumed that primary path is already configured and we are just configuring the floating route. :(

   Source: Adapted from community discussion — ZayaB

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9. Question 649 · 1334 in bank

   How does HSRP provide first hop redundancy?

   • AIt load-balances Layer 2 traffic along the path by flooding traffic out all interfaces configured with the same VLAN.
   • BIt uses a shared virtual MAC and a virtual IP address to a group of routers that serve as the default gateway for hosts on a LAN.
   • CIt forwards multiple packets to the same destination over different routed links in the data path.
   • DIt load-balances traffic by assigning the same metric value to more than one route to the same destination in the IP routing table.

   Show answer

   Answer: B

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/xe-16/fhp-xe-16-book/fhp-hsrp-mgo.html

   Source: Adapted from community discussion — alexiro

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10. Question 650 · 1334 in bank

    Refer to the exhibit. Which action establishes the OSPF neighbor relationship without forming an adjacency?

    

    • Amodify hello interval
    • Bmodify process ID
    • Cmodify priority
    • Dmodify network type

    Show answer

    Answer: A

    Explanation

    According to OCG Volume 1 Chapter 21 page 515 : "Interestingly, if you misconfigure network type settings such that one router uses broadcast, and the other uses point-to-point, the following occurs: ■ The two routers become fully adjacent neighbors (that is, they reach a full state). ■ They exchange their LSDBs. ■ They do not add IP routes to the IP routing table. The reason for not adding the routes has to do with the details of LSAs and how the use of a DR (or not) changes those LSAs. Basically, the two routers expect different details in the LSAs, and the SPF algorithm notices those differences and cannot trust the LSAs because of those differences." So D cannot be the correct answer.

    Source: Adapted from community discussion — iGlitch

    References

    • cisco.com documentation
    • cisco.com documentation
    • cisco.com documentation
    • Cisco documentation
    • Cisco documentation

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200-301 practice, question 641. 1334 questions available.