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Questions and Answers

What is a key disadvantage of routing information being exchanged periodically in link state routing protocols?

  • It generates unnecessary traffic consuming bandwidth. (correct)
  • It increases the reliability of data transmission.
  • It eliminates the need for neighbor tables.
  • It enhances the speed of data processing.

    • Which table in a link state routing protocol stores information about neighboring routers?

  • Cost table
  • Routing table
  • Topology table
  • Neighbor table (correct)

    • How do link state protocols differ from distance vector protocols in handling routing updates?

  • Link state protocols rely on periodic updates.
  • Link state protocols notify each other of route changes. (correct)
  • Distance vector protocols use triggered updates.
  • Link state protocols send complete routing tables.

    • What advantage does the link state routing protocol provide with its tables compared to distance vector protocols?

    <p>It has knowledge of both best and backup routes.</p> Signup and view all the answers

    What can trigger a partial update in link state routing protocols?

    <p>A change in the network topology.</p> Signup and view all the answers

    What is the purpose of the command 'router rip' in the configuration of a router?

    <p>To initiate the Routing Information Protocol</p> Signup and view all the answers

    In Router 2's EIGRP configuration, which command is necessary to prevent automatic summarization of routes?

    <p>no auto-summary</p> Signup and view all the answers

    Which network is not included in Router 3's RIP configuration?

    <p>192.168.5.0</p> Signup and view all the answers

    What is the main characteristic of EIGRP compared to RIP?

    <p>EIGRP is a hybrid routing protocol with advanced features</p> Signup and view all the answers

    How many network statements does Router 1 include in its EIGRP configuration?

    <p>2</p> Signup and view all the answers

    What is one advantage of dynamic routing protocols?

    <p>They are easier to configure, especially on larger networks.</p> Signup and view all the answers

    Which dynamic routing protocol is NOT mentioned as an example?

    <p>BGP</p> Signup and view all the answers

    What is a significant drawback of using dynamic routing protocols?

    <p>They consume bandwidth for updates.</p> Signup and view all the answers

    How do Distance Vector Routing Protocols determine the best routing path?

    <p>By measuring the number of hops to the destination.</p> Signup and view all the answers

    What issue can arise with Distance Vector Routing Protocols when a route becomes unavailable?

    <p>They create routing loops.</p> Signup and view all the answers

    What is the primary method of communication for Distance Vector Routing Protocols?

    <p>They periodically advertise their routing table to neighboring routers.</p> Signup and view all the answers

    What challenge does using dynamic routing protocols present regarding router resources?

    <p>They increase the workload on the router's hardware.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of Distance Vector Routing Protocols?

    <p>They assess routing paths based on bandwidth usage.</p> Signup and view all the answers

    Study Notes

    Dynamic Routing Protocols

    • Dynamic routing protocols enable routers to automatically learn network topology updates.
    • These protocols reduce the need for manual configuration, but require ongoing CPU and bandwidth usage.
    • Examples include OSPF, EIGRP, and RIP.
    • Benefits:
      • Easy configuration, even on large networks.
      • Automatic route selection in case of link failures.
      • Load balancing across multiple links.
    • Drawbacks:
      • Bandwidth consumption due to routing updates.
      • Increased CPU and RAM usage on routers.

    Distance Vector Routing Protocols (DVR)

    • DVRs use hop count as a metric for determining the best routing path.
    • They advertise routing tables to all directly connected neighbors at intervals, potentially consuming a lot of bandwidth.
    • Benefits:
      • Simple to deploy and manage.
      • Low administrative overhead.
    • Drawbacks:
      • High bandwidth consumption.
      • Susceptible to routing loops.
    • Link state protocols calculate the best routing path based on path speed and resource cost.
    • They use an algorithm to determine the best path and send only updates when changes occur, rather than full routing tables.
    • Key differences from DVRs:
      • Link state protocols don't send full routing tables.
      • They notify each other when route changes are detected.
    • Table maintenance:
      • Neighbor Table: Stores information about neighboring routers.
      • Topology Table: Stores the complete network topology.
      • Routing Table: Stores the most efficient routes.
    • Benefits:
      • Maintain both best and backup routes.
      • Avoids unnecessary bandwidth consumption through triggered updates.
      • Partial updates are transmitted when topology changes occur.

    Routing Information Protocol (RIP)

    • RIP is a widely used dynamic routing protocol.
    • It utilizes hop count as a metric for routing decisions.
    • Configuration Steps (Example):
      • Router 1:
        • enable
        • configuration terminal
        • router rip
        • network 192.168.2.0
        • network 192.168.1.0
      • Router 2:
        • enable
        • configuration terminal
        • router rip
        • network 192.168.2.0
        • network 192.168.3.0
        • network 192.168.5.0
      • Router 3:
        • enable
        • configuration terminal
        • router rip
        • network 192.168.3.0
        • network 192.168.4.0

    Enhanced Interior Gateway Routing Protocol (EIGRP)

    • EIGRP is a Cisco proprietary hybrid routing protocol.
    • It combines elements of both distance vector and link-state protocols.
    • Configuration Steps (Example):
      • Router 1:
        • enable
        • configuration terminal
        • router eigrp 100
        • network 192.168.2.0
        • network 192.168.1.0
        • no auto-summary
      • Router 2:
        • enable
        • configuration terminal
        • router eigrp 100
        • network 192.168.2.0
        • network 192.168.3.0
        • network 192.168.5.0
        • no auto-summary
      • Router 3:
        • enable
        • configuration terminal
        • router eigrp 100
        • network 192.168.3.0
        • network 192.168.4.0
        • no auto-summary

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