200-301 practice questions 681–690

1. Question 681 · 1334 in bank

   

   Refer to the exhibit. Which outcome is expected when PC_A sends data to PC_B after their initial communication?

   • AThe source MAC address is changed.
   • BThe destination MAC address is replaced with ffff.ffff.ffff.
   • CThe source and destination MAC addresses remain the same.
   • DThe switch rewrites the source and destination MAC addresses with its own.

   Show answer

   Answer: C

   Explanation

   You have a TCP/IP network. This means that PC A and PC B have an IP address each. PC A knows PC B's address and creates an IP packet for PC B. Then, the packet (Layer 3) becomes an Ethernet frame (Layer 2): PC A gets PC B's MAC address and uses it as the destination L2 address. When the frame arrives at SW1, the switch looks at the destination MAC address and controls (in its MAC table) to which port that address is associated. Then, the switch sends the frame to PC B through that port (forwarding phase). The switch leaves unchanged BOTH the source and the destination MAC addresses inside the frame. Answer C is correct.

   Source: Adapted from community discussion — [Removed]

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2. Question 682 · 1334 in bank

   Refer to the exhibit. Which address and mask combination represents a summary of the routes learned by EIGRP?

   

   • A192.168.25.0 255.255.255.240
   • B192.168.25.0 255.255.255.252
   • C192.168.25.16 255.255.255.240
   • D192.168.25.16 255.255.255.252
   • E192.168.25.28 255.255.255.240
   • F192.168.25.28 255.255.255.252

   Show answer

   Answer: C

   Explanation

   ------------------------------------------ | ====== | 192.168.25|.20 -->0001| 0100 192.168.25|.16 -->0001| 0000 192.168.25|.24 -->0001| 1000 192.168.25|.24 -->0001| 1000 128 64 32 16| 8 4 2 1 --------------------- 0 0 0 1| 0 1 0 0 0 0 0 1| 0 0 0 0 0 0 0 1| 1 0 0 0 0 0 0 1| 1 0 0 0 192.168.25.16/28 == 255.255.255.240 ==>192.168.25.16 /255.255.255.240 === >> answer is C <<===

   Source: Adapted from community discussion — LLAMBRA

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3. Question 683 · 1334 in bank

   Refer to the exhibit. Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router?

   

   • A10.1.1.2
   • B10.154.154.1
   • C172.16.5.1
   • D192.168.5.3

   Show answer

   Answer: C

   Explanation

   The highest IP address of all loopback interfaces will be chosen -> Loopback 0 will be chosen as the router ID.

   Source: Adapted from community discussion — Ali526

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4. Question 684 · 1334 in bank

   Refer to the exhibit. When running EIGRP, what is required for RouterA to exchange routing updates with RouterC?

   

   • AAS numbers must be changed to match on all the routers
   • BLoopback interfaces must be configured so a DR is elected
   • CThe no auto-summary command is needed on Router A and Router C
   • DRouter B needs to have two network statements, one for each connected network

   Show answer

   Answer: A

   Explanation

   To become neighbors, the following parameters must match on both routers: ASN (Autonomous System Number) subnet K values (components of metric) https://geek-university.com/ccna/eigrp-neighbors/

   Source: Adapted from community discussion — Stonetales987

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5. Question 685 · 1334 in bank

   A network administrator is troubleshooting the OSPF configuration of routers R1 and R2. The routers cannot establish an adjacency relationship on their common Ethernet link.

   

   The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2. Based on the information in the graphic, what is the cause of this problem?

   • AThe OSPF area is not configured properly.
   • BThe priority on R1 should be set higher.
   • CThe cost on R1 should be set higher.
   • DThe hello and dead timers are not configured properly.
   • EA backup designated router needs to be added to the network.
   • FThe OSPF process ID numbers must match.

   Show answer

   Answer: D

   Explanation

   In OSPF, the hello and dead intervals must match and here we can see the hello interval is set to 5 on R1 and 10 on R2. The dead interval is also set to 20 on R1 but it is 40 on R2.

   Source: Adapted from community discussion — dipanjana1990

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6. Question 686 · 1334 in bank

   Select 2

   Refer to the exhibit. Which two statements are true about the loopback address that is configured on RouterB? (Choose two.)

   

   • AIt ensures that data will be forwarded by RouterB.
   • BIt provides stability for the OSPF process on RouterB.
   • CIt specifies that the router ID for RouterB should be 10.0.0.1.
   • DIt decreases the metric for routes that are advertised from RouterB.
   • EIt indicates that RouterB should be elected the DR for the LAN.

   Show answer

   Answer: BC

   Explanation

   A loopback interface never comes down even if the link is broken so it provides stability for the OSPF process (for example we use that loopback interface as the router-id) - B is correct. The router-ID is chosen in the order below: The highest IP address assigned to a loopback (logical) interface. If a loopback interface is not defined, the highest IP address of all active router's physical interfaces will be chosen. -The loopback interface will be chosen as the router ID of RouterB - C is correct.

   Source: Adapted from community discussion — MikD4016

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7. Question 687 · 1334 in bank

   If all OSPF routers in a single area are configured with the same priority value, what value does a router use for the OSPF router ID in the absence of a loopback interface?

   • Athe IP address of the first Fast Ethernet interface
   • Bthe IP address of the console management interface
   • Cthe highest IP address among its active interfaces
   • Dthe lowest IP address among its active interfaces
   • Ethe priority value until a loopback interface is configured

   Show answer

   Answer: C

   Explanation

   C is correct. A router ID is determined in the following order: 1. using the router-id command under the OSPF process to statically configure the router ID. 2. using the highest IP address of the router’s loopback interfaces. 3. using the highest IP address of the router’s active physical interfaces.

   Source: Adapted from community discussion — M3rc3r08

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8. Question 688 · 1334 in bank

   Select 2

   The OSPF Hello protocol performs which of the following tasks? (Choose two.)

   • AIt provides dynamic neighbor discovery.
   • BIt detects unreachable neighbors in 90 second intervals.
   • CIt maintains neighbor relationships.
   • DIt negotiates correctness parameters between neighboring interfaces.
   • EIt uses timers to elect the router with the fastest links as the designated router.
   • FIt broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF.

   Show answer

   Answer: AC

   Explanation

   B: wrong, by default 40 seconds D: wrong, not only between neighbouring interfaces E: wrong, designated router is not elected based on its hello-response time, but on its priority / router ID F: wrong, multicast and not broadcast is used for hello packets This leaves us with the correct answers A & B

   Source: Adapted from community discussion — vadiminski

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9. Question 689 · 1334 in bank

   Select 2

   What are two requirements for an HSRP group? (Choose two.)

   • Aexactly one active router
   • Bone or more standby routers
   • Cone or more backup virtual routers
   • Dexactly one standby active router
   • Eexactly one backup virtual router

   Show answer

   Answer: AB

   Explanation

   A and B are correct. The below reference shows why D must be wrong: "HSRP allows you to configure two or more routers as standby routers and only a single router as an active router at a time. All the routers in a single HSRP group shares a single MAC address and IP address, which acts as a default gateway to the local network." https://www.geeksforgeeks.org/hot-standby-router-protocol-hsrp/#:~:text=HSRP%20allows%20you%20to%20configure,gateway%20to%20the%20local%20network.

   Source: Adapted from community discussion — Jbcrggddfhh

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10. Question 690 · 1334 in bank

    Select 2

    Which two pieces of information can you learn by viewing the routing table? (Choose two.)

    • Awhether an ACL was applied inbound or outbound to an interface
    • Bthe EIGRP or BGP autonomous system
    • Cwhether the administrative distance was manually or dynamically configured
    • Dwhich neighbor adjacencies are established
    • Ethe length of time that a route has been known

    Show answer

    Answer: CE

    Explanation

    I also thought D and E at first - but then forgot that adjacencies are shown with (confg)# sh ip (ospf, eigrp) neighbor Most logical is answer given (this is hoping and assuming that you would not manually input the same admin distance as an existing protocol on a route - I see myself over thinking these answers....)

    Source: Adapted from community discussion — hokieman91

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200-301 practice, question 681. 1334 questions available.