OSPF and RIP Routing Protocols Quiz
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Questions and Answers

What is the primary metric used by RIP to determine the best route?

  • Packet Loss
  • Latency
  • Bandwidth
  • Hop Count (correct)

Which UDP port is used for OSPF routing updates?

  • 161
  • 520 (correct)
  • 80
  • 69

What does the 'Traceoff' command type signify in RIP messages?

  • Response to a request
  • Request for a table update
  • Obsolete and ignored (correct)
  • Reserved for Sun Microsystems

In OSPF, what factor influences neighbor acquisition?

<p>IP address of the neighbor (A)</p> Signup and view all the answers

Which network characteristic makes shortest hop count inefficient in multi-hop wireless networks?

<p>Longest wireless distances (B)</p> Signup and view all the answers

What is the primary benefit of RIP's dynamic DV routing algorithm?

<p>Requires less CPU time but more convergence time (B)</p> Signup and view all the answers

What is the purpose of the Metric field in RIP?

<p>Measures how 'good' a route is by hop count (C)</p> Signup and view all the answers

In RIP, what is the significance of the Hold-Down Timer?

<p>Delays routing table updates for routes with high metrics (B)</p> Signup and view all the answers

What role does the Update Timer play in RIP?

<p>Controls the time between routing updates (D)</p> Signup and view all the answers

How does RIP use the Flush Timer?

<p>Prevents immediate deletion of routes after timeout (C)</p> Signup and view all the answers

What is the purpose of the Timeout Timer in RIP?

<p>Determines when a route is no longer available (B)</p> Signup and view all the answers

How does RIP utilize the Hold-Down Timer?

<p>Delays routing table updates for routes with high metrics (A)</p> Signup and view all the answers

What information does the BGP OPEN message contain?

<p>Neighbor reachability information (A)</p> Signup and view all the answers

How does BGP acquire neighbors?

<p>By exchanging BGP OPEN messages (C)</p> Signup and view all the answers

What is one of the key functions of a BGP router?

<p>Propagating route updates between routers (B)</p> Signup and view all the answers

Which protocol is commonly used for neighbor reachability in a BGP network?

<p>OSPF (C)</p> Signup and view all the answers

What type of information is shared during BGP route updates?

<p>Neighbor reachability information (C)</p> Signup and view all the answers

In the context of BGP, what does 'neighbor acquisition' refer to?

<p>Establishing connections with neighboring routers (A)</p> Signup and view all the answers

Flashcards

What is RIP's primary route selection metric?

This metric is used to decide the best route in RIP, counting the number of routers the data packet needs to traverse to reach its destination.

What UDP port does RIP use for routing updates?

RIP uses UDP port 520 for transmitting and receiving routing updates between routers.

What is a 'Traceoff' message in RIP?

RIP sends a 'Traceoff' command to mark a route as obsolete and ignore it during route calculations.

What determines neighbor acquisition in OSPF?

OSPF neighbors establish connections based on matching network addresses. If IP addresses match, they become OSPF neighbors.

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Why can shortest hop count be inefficient in multi-hop wireless networks?

In multi-hop wireless networks, wireless signals can be weak and distances long, leading to inefficient shortest hop routing due to unpredictable hop counts.

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What is the benefit of RIP's dynamic DV routing algorithm?

RIP uses a dynamic DV routing algorithm, which is less computationally intensive compared to other methods but requires more time to converge to the optimal route.

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What is the purpose of the Metric field in RIP?

In RIP, the Metric field indicates the number of hops in a route, serving as a measure of how 'good' a route is.

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What is the significance of the Hold-Down Timer in RIP?

RIP uses the Hold-Down Timer to delay routing updates for routes with high metrics, preventing the router from quickly switching to a less optimal route.

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What role does the Update Timer play in RIP?

The Update Timer in RIP controls the frequency of sending routing updates, ensuring network consistency.

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How does RIP use the Flush Timer?

The Flush Timer in RIP prevents routes from being immediately removed from the routing table after a timeout, giving them a chance to reactivate.

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What is the purpose of the Timeout Timer in RIP?

The Timeout Timer in RIP determines how long a route is considered valid before it's marked as unavailable and potentially removed.

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How does RIP utilize the Hold-Down Timer?

RIP uses the Hold-Down Timer to delay routing updates for routes with high metrics, ensuring a more stable routing table and preventing rapid changes due to fluctuations in route metrics.

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What information does the BGP OPEN message contain?

The BGP OPEN message is an important exchange for establishing connections between BGP routers. It contains information about the router, its capabilities, and the network it's part of.

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How does BGP acquire neighbors?

BGP routers establish neighbor relationships by exchanging BGP OPEN messages. This exchange allows them to determine if they can communicate and share routing information.

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What is one of the key functions of a BGP router?

One of the primary tasks of a BGP router is to propagate route updates, disseminating information about reachable networks across the network.

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Which protocol is commonly used for neighbor reachability in a BGP network?

OSPF is commonly used for establishing neighbor reachability in a BGP network, ensuring reliable communication between BGP routers.

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What type of information is shared during BGP route updates?

BGP route updates exchange information about network reachability, including the path to reach a destination network, allowing routers to make informed routing decisions.

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In the context of BGP, what does 'neighbor acquisition' refer to?

In BGP, neighbor acquisition refers to the process of establishing communication with neighboring routers, enabling the exchange of routing information.

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Study Notes

RIP (Routing Information Protocol)

  • Version field specifies the RIP version (1 or 2)
  • Address Family ID identifies the addressing protocol (CLNS, IPX, IP, etc.)

RIP Metrics and Timers

  • Metric measures the "goodness" of a route based on hop count
  • RIP Timers:
    • Update Timer: controls time between routing updates (default = 30 seconds + small random delay)
    • Timeout Timer: determines when a route is no longer available (default = 180 seconds)
    • Flush Timer: controls the interval before a route is deleted (default = 120 seconds)
    • Hold-Down Timer: delays RT updates for a route with a high metric (many hops)

Cisco Routers and RIP

  • Configuring RIP requires a series of configuration steps
  • RIP is a Distance Vector Routing protocol

Router Architecture

  • Router Architecture components:
    • Routing Info
    • Routing Update
    • DT (Distance Table) Agent
    • Lookup
    • RT (Routing Table) Update
    • RP (Routing Processor)
  • Router components:
    • Data Processor (DP)
    • Input Ports
    • Output Ports
    • Switch Fabric

Routing Protocols

  • Routing protocols:
    • Distance Vector Routing
    • Link State Routing
    • RIP
    • OSPF
    • Source Routing
    • BGP
    • Static Routing

RIP Messages

  • RIP messages encapsulated in UDP payload
  • Command types:
    • Request: requests a partial or full table update from another router
    • Response: response to a request (route updates use this command field)

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Test your knowledge on OSPF and RIP routing protocols, including their features, performance, and implementations. Learn about the differences between OSPF and RIP in terms of convergence time, network support, metrics, and efficiency.

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