200-301 practice questions 621–630

1. Question 621 · 1334 in bank

   A packet is destined for 10.10.1.22. Which static route does the router choose to forward the packet?

   • Aip route 10.10.1.0 255.255.255.240 10.10.255.1
   • Bip route 10.10.1.20 255.255.255.252 10.10.255.1
   • Cip route 10.10.1.16 255.255.255.252 10.10.255.1
   • Dip route 10.10.1.20 255.255.255.254 10.10.255.1

   Show answer

   Answer: B

   Explanation

   - the destined ip address is 10.10.1.22 A- the range is 10.10.1.0 to 10.10.1.15 --> wrong range B- the range is 10.10.1.20 to 10.10.1.23 --> right range C- the range is 10.10.1.16 to 10.10.1.19 --> wrong range D- the range is 10.10.1.20 to 10.10.1.21 --> wrong range So the only correct range is answer B, so B is the correct answer if there are more than 1 correct range, then the correct answer will be the range with the longer prefix.

   Source: Adapted from community discussion — zizo1982

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2. Question 622 · 1334 in bank

   

   Refer to the exhibit. How does the router manage traffic to 192.168.12.16?

   • AIt chooses the EIGRP route because it has the lowest administrative distance.
   • BIt load-balances traffic between all three routes.
   • CIt chooses the OSPF route because it has the longest prefix inclusive of the destination address.
   • DIt selects the RIP route because it has the longest prefix inclusive of the destination address.

   Show answer

   Answer: D

   Explanation

   The answer is wrong. The router can't use the network OSPF because it's another network and not include the destination address (192.168.12.0/28 --> from 192.168.12.0 to 192.168.12.15). The correct answer is D because the RIP route use a /27 subnet and include the destination address (192.168.12.0/27 --> from 192.168.12.0 to 192.168.12.31). If i wrong please correct me

   Source: Adapted from community discussion — MM_9

   References

   • Cisco documentation

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3. Question 623 · 1334 in bank

   Select 2

   What are two reasons for an engineer to configure a floating static route? (Choose two.)

   • Ato enable fallback static routing when the dynamic routing protocol fails
   • Bto route traffic differently based on the source IP of the packet
   • Cto automatically route traffic on a secondary path when the primary path goes down
   • Dto support load balancing via static routing
   • Eto control the return path of traffic that is sent from the router

   Show answer

   Answer: AC

   Explanation

   Floating static routes are static routes that have an administrative distance greater than the administrative distance of dynamic routes. Administrative distances can be configured on a static route so that the static route is less desirable than a dynamic route. In this manner, the static route is not used when the dynamic route is available. However, if the dynamic route is lost, the static route can take over, and traffic can be sent through this alternate route. If this alternate route is provided using a DDR interface, then that interface can be used as a backup mechanism. Used when primary route is Not available.

   Source: Adapted from community discussion — dicksonpwc

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4. Question 624 · 1334 in bank

   

   Refer to the exhibit. How does router R1 handle traffic to 192.168.10.16?

   • AIt selects the IS-IS route because it has the shortest prefix inclusive of the destination address
   • BIt selects the RIP route because it has the longest prefix inclusive of the destination address
   • CIt selects the OSPF route because it has the lowest cost
   • DIt selects the EIGRP route because it has the lowest administrative distance

   Show answer

   Answer: B

   References

   • Cisco documentation

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5. Question 625 · 1334 in bank

   

   Refer to the exhibit. An engineer must add a subnet for a new office that will add 20 users to the network. Which IPv4 network and subnet mask combination does the engineer assign to minimize wasting addresses?

   • A10.10.225.48 255.255.255.240
   • B10.10.225.32 255.255.255.240
   • C10.10.225.48 255.255.255.224
   • D10.10.225.32 255.255.255.224

   Show answer

   Answer: D

   Explanation

   D is correct! Find the subnet mask *To have 20 User in a subnet We have to use /27 prefix * So Host count for /27 prefix is (2^5-2)=30 * Subnet Mask for /27 prefix is (sum of Network bits (128+64+32)=224 , so 255.255.255.224 Find the network ID *As per the /27 prefix each subnet has 30 host and 32 including network ID & Broadcast ID * so first network ID is 10.10.255.0 and the second will be 10.10.255.32

   Source: Adapted from community discussion — ZUMY

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6. Question 626 · 1334 in bank

   Select 2

   

   Refer to the exhibit. A router received these five routes from different routing information sources. Which two routes does the router install in its routing table? (Choose two.)

   • AOSPF route 10.0.0.0/30
   • BIBGP route 10.0.0.0/30
   • COSPF route 10.0.0.0/16
   • DEIGRP route 10.0.0.1/32
   • ERIP route 10.0.0.0/30

   Show answer

   Answer: AD

   Explanation

   Ref: Route Selection in Cisco Routers - Cisco “… Summary The LONGEST PREFIX MATCH always wins among the routes actually installed in the routing table, while the routing protocol with the LOWEST ADMINISTRATIVE DISTANCE always wins when installing routes into the routing table. …” You have 5 routes from 4 different routing protocols. Two of these routes are from OSPF: the router must choose (between them) which one to install in the routing table, and here the longest prefix match criteria wins (router chooses OSPF route 10.0.0.0/30). Now, you have 4 routes. 3 routes are all /30 routes (same prefix length): the router chooses on the basis of lowest administrative distance, and OSPF wins (administrative distance for these protocols is OSPF 110, which is lower than RIP 120, which is lower than BGP 200). The last route is an EIGRP one, and this is also a host route (look at the /32 prefix). There can’t be a longest prefix than a host route. Also, this route doesn’t have to compete with any other route to be installed in the routing table. So, this route is the router’s second choice. Answers A and D are correct.

   Source: Adapted from community discussion — [Removed]

   References

   • Cisco documentation

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7. Question 627 · 1334 in bank

   

   Refer to the exhibit. To which device does Router1 send packets that are destined to host 10.10.13.165?

   • ARouter2
   • BRouter3
   • CRouter4
   • DRouter5

   Show answer

   Answer: B

   Explanation

   Here's a short subnet chart. You can write down a chart before the test starts /32 - 1 /31 - 2 /30 - 4 /29 - 8 /28 - 16 /27 - 32 /26 - 64 /25 - 128 /24 - 256 /23 - 514 Check the routing table and look for a subnet that fits the 10.10.13.165 IP address. the only one that fits is 10.10.13.160/29. As you can see in this chart, /29 is equal to 8 total addresses and 6 total hosts (You have to subtract 2 from the total number of addresses to get the amount of hosts). 10.10.13.160 +6 = 166 which is the last usable address for 10.10.13.160/29. You pretty much do the same thing to find the router it'll send it out of.

   Source: Adapted from community discussion — TheLorenz

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8. Question 628 · 1334 in bank

   R1 has learned route 10.10.10.0/24 via numerous routing protocols. Which route is installed?

   • Aroute with the next hop that has the highest IP
   • Broute with the lowest cost
   • Croute with the lowest administrative distance
   • Droute with the shortest prefix length

   Show answer

   Answer: C

   Explanation

   Route Preference: 1. Longest Prefix 2. Administrative Distance 3. Metric In this specific question, the first option is: Administrative Distance.

   Source: Adapted from community discussion — diamcle

   References

   • Cisco documentation

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9. Question 629 · 1334 in bank

   Select 2

   Which two minimum parameters must be configured on an active interface to enable OSPFV2 to operate? (Choose two.)

   • AOSPF process ID
   • BOSPF MD5 authentication key
   • COSPF stub flag
   • DIPv6 address
   • EOSPF area

   Show answer

   Answer: AE

   Explanation

   Two basics ways to enable OSPFv2 in an active interface are: 1) OSPFv2 Traditional configuration: R1(config)# router ospf R1(config-router)# network area 2) OSPv2 Interface configuration: R1(config)# interface gigabitEthernet 0/0 R1(config-router)# ip ospf area Where: R1 is the hostname of the router. As you can see, the "process-id" and the "area-number" are necessary parameters in both configurations, including the quad-zero configuration that is similar to the "Traditional" way.

   Source: Adapted from community discussion — raul_kapone

   References

   • Cisco documentation
   • Cisco documentation

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10. Question 630 · 1334 in bank

    Refer to the exhibit. What commands are needed to add a sub-interface to Ethernet0/0 on R1 to allow for VLAN 20, with IP address 10.20.20.1/24?

    

    • AR1(config)#interface ethernet0/0 R1(config-if)#encapsulation dot1q 20 R1(config-if)#ip address 10.20.20.1 255.255.255.0
    • BR1(config)#interface ethernet0/0.20 R1(config-if)#encapsulation dot1q 20 R1(config-if)#ip address 10.20.20.1 255.255.255.0
    • CR1(config)#interface ethernet0/0.20 R1(config-if)#ip address 10.20.20.1 255.255.255.0
    • DR1(config)#interface ethernet0/0 R1(config-if)#ip address 10.20.20.1 255.255.255.0

    Show answer

    Answer: B

    Explanation

    For a Router on a stick, you need to: 1. create a sub-interface 2. encapsulate dot1q with the VLAN ID 3. Assign an IP address

    Source: Adapted from community discussion — ZayaB

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200-301 practice, question 621. 1334 questions available.