COMP8250 Advanced Topics in Computer Networks Assignment 1
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Questions and Answers

What is the primary default link for routes beyond NAP not known to the customer?

  • SYD link
  • Neither MEL nor SYD links
  • MEL link (correct)
  • Both MEL and SYD links

    • When does the activation of the SYD link occur?

  • When the customer requests it
  • When the MEL link experiences a failure (correct)
  • The SYD link is never activated
  • Randomly, at regular intervals

    • Which link should be preferred to accept all incoming traffic from NAP?

  • Both MEL and SYD links
  • SYD link
  • MEL link (correct)
  • Neither MEL nor SYD links

    • What happens when router XR consolidates the two prefixes A1 and A2?

    <p>XR creates a summary address ASUM and communicates it downstream to router YR</p> Signup and view all the answers

    What is the restriction on routers UR and VR regarding the summary address ASUM?

    <p>They are restricted from re-announcing this address back to YR</p> Signup and view all the answers

    What happens when router XR experiences a failure in reaching the network address A1?

    <p>The summary address ASUM is still successfully installed in the routing tables of all downstream routers</p> Signup and view all the answers

    What is the main objective of this assignment?

    <p>To test students' knowledge of Classless Inter-Domain Routing (CIDR) and Border Gateway Protocol (BGP)</p> Signup and view all the answers

    What is the type of this assignment?

    <p>Problem-solving (individual) assignment</p> Signup and view all the answers

    What is the purpose of the problem-solving assignment?

    <p>To familiarize students with real-world problem situations and issues</p> Signup and view all the answers

    What is the lecturer's advice regarding the use of ChatGPT and other AI tools?

    <p>Students should exercise caution when using ChatGPT and other AI tools, as the responses may not always be accurate and can be misleading</p> Signup and view all the answers

    What is the lecturer's advice regarding the use of one's own words when responding to questions?

    <p>Students should use their own words when responding to questions</p> Signup and view all the answers

    What is the total marks and weighting (value) of this assignment?

    <p>Total Marks: 30, Weighting (Value): 20%</p> Signup and view all the answers

    What is the required file format for written assignments?

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

    What is the purpose of the preview feature in the submission process?

    <p>To review the assignment for completeness and accuracy</p> Signup and view all the answers

    What is the late submission penalty for written assessments?

    <p>A 5% penalty per day up to 7 days, then a grade of 0</p> Signup and view all the answers

    What is the purpose of Turnitin in the assessment process?

    <p>To generate the originality report</p> Signup and view all the answers

    When is the submission time for all written assessments?

    <p>11:55 pm</p> Signup and view all the answers

    What is the consequence of submitting an assignment after the 7-day late period?

    <p>A 0 grade</p> Signup and view all the answers

    What is the sequence of steps leading to the installation of the best route to network N in each router in Case 1?

    <p>The routers in AS1 receive the route from AS2 first, then the route from AS3, and install the best route accordingly.</p> Signup and view all the answers

    Do all four routers in AS1 record the same best route to reach network N in Case 1?

    <p>Yes, all four routers in AS1 record the same best route to reach network N.</p> Signup and view all the answers

    What is the sequence of steps leading to the installation of the best route to network N in each router in Case 2?

    <p>The routers in AS1 receive the route from AS2 first, then the route from AS3, and install the best route accordingly.</p> Signup and view all the answers

    Do all four routers in AS1 record the same best route to reach network N in Case 2?

    <p>Yes, all four routers in AS1 record the same best route to reach network N.</p> Signup and view all the answers

    Is the best route to network N in each router in Case 2 exactly the same as in Case 1?

    <p>Yes, the best route to network N in each router in Case 2 is exactly the same as in Case 1.</p> Signup and view all the answers

    What is the most important factor in determining the best route to network N in the given scenarios?

    <p>The length of the AS path for the routes from AS2 and AS3.</p> Signup and view all the answers

    What is the primary factor contributing to the potential routing instability in the network described in the text?

    <p>The loss of the announcement on the YR-UR link</p> Signup and view all the answers

    Why does XR suppress the announcement of summary address ASUM?

    <p>To ensure that only the most specific route is announced</p> Signup and view all the answers

    What is the purpose of the route reflectors RR1 and RR2 in the BGP topology described?

    <p>To manage the clusters C1 and C2 and their respective BGP routers</p> Signup and view all the answers

    What is the relationship between AS1 and the autonomous systems AS2 and AS3 in the BGP topology?

    <p>AS1 is a peer of AS2 and AS3</p> Signup and view all the answers

    What is the significance of the bold dotted lines in the BGP topology?

    <p>They represent the IBGP peering links between the routers</p> Signup and view all the answers

    Study Notes

    Default Routes

    • In a primary/backup setup, prioritize the default link for routes beyond NAP not known to the customer.
    • In the primary/backup setup, the primary default is the MEL link, and the SYD link serves as the secondary default.
    • The SYD link is activated only in the event of a failure in the MEL link.

    Inbound Traffic

    • Prefer to accept all incoming traffic from NAP via the primary MEL link and not the secondary SYD link.
    • Activate the SYD link only when the MEL link experiences a failure.

    Classless Inter-Domain Routing (CIDR)

    • CIDR involves consolidating multiple prefixes into a single summary address.
    • Router XR consolidates two prefixes A1 and A2 to create a summary address, ASUM, and communicates it downstream to router YR.
    • Router YR disseminates the summary address to its downstream peer routers UR and VR.
    • Routers UR and VR are restricted from re-announcing this address back to YR, but they are permitted to exchange this information with each other.

    Border Gateway Protocol (BGP)

    • BGP is used in a route reflector based BGP topology.
    • In a route reflector based BGP topology, route reflectors manage clusters of clients.
    • BGP routers peer with other autonomous systems to exchange routes.
    • AS1 peers with AS2 and AS3 through routers R1 and R2, respectively.

    Route Advertisement

    • Router XR announces a route to network N via R1 (Route1) to AS1.
    • Router XR announces a route to network N via R2 (Route2) to AS1.
    • Route reflectors propagate routes to their downstream peer routers.
    • Routers may lose route announcements due to link failures, leading to potential routing instability.

    Routing Instability

    • Routing instability can occur when routers lose route announcements due to link failures.
    • Factors contributing to routing instability include:
      • Link failures
      • Loss of route announcements
      • Inconsistent routing information among routers

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