18 Questions
What is the primary metric used by RIP to determine the best route?
Hop Count
Which UDP port is used for OSPF routing updates?
520
What does the 'Traceoff' command type signify in RIP messages?
Obsolete and ignored
In OSPF, what factor influences neighbor acquisition?
IP address of the neighbor
Which network characteristic makes shortest hop count inefficient in multi-hop wireless networks?
Longest wireless distances
What is the primary benefit of RIP's dynamic DV routing algorithm?
Requires less CPU time but more convergence time
What is the purpose of the Metric field in RIP?
Measures how 'good' a route is by hop count
In RIP, what is the significance of the Hold-Down Timer?
Delays routing table updates for routes with high metrics
What role does the Update Timer play in RIP?
Controls the time between routing updates
How does RIP use the Flush Timer?
Prevents immediate deletion of routes after timeout
What is the purpose of the Timeout Timer in RIP?
Determines when a route is no longer available
How does RIP utilize the Hold-Down Timer?
Delays routing table updates for routes with high metrics
What information does the BGP OPEN message contain?
Neighbor reachability information
How does BGP acquire neighbors?
By exchanging BGP OPEN messages
What is one of the key functions of a BGP router?
Propagating route updates between routers
Which protocol is commonly used for neighbor reachability in a BGP network?
OSPF
What type of information is shared during BGP route updates?
Neighbor reachability information
In the context of BGP, what does 'neighbor acquisition' refer to?
Establishing connections with neighboring routers
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)
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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