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Questions and Answers
What is a key disadvantage of routing information being exchanged periodically in link state routing protocols?
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?
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?
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?
What advantage does the link state routing protocol provide with its tables compared to distance vector protocols?
What can trigger a partial update in link state routing protocols?
What can trigger a partial update in link state routing protocols?
What is the purpose of the command 'router rip' in the configuration of a router?
What is the purpose of the command 'router rip' in the configuration of a router?
In Router 2's EIGRP configuration, which command is necessary to prevent automatic summarization of routes?
In Router 2's EIGRP configuration, which command is necessary to prevent automatic summarization of routes?
Which network is not included in Router 3's RIP configuration?
Which network is not included in Router 3's RIP configuration?
What is the main characteristic of EIGRP compared to RIP?
What is the main characteristic of EIGRP compared to RIP?
How many network statements does Router 1 include in its EIGRP configuration?
How many network statements does Router 1 include in its EIGRP configuration?
What is one advantage of dynamic routing protocols?
What is one advantage of dynamic routing protocols?
Which dynamic routing protocol is NOT mentioned as an example?
Which dynamic routing protocol is NOT mentioned as an example?
What is a significant drawback of using dynamic routing protocols?
What is a significant drawback of using dynamic routing protocols?
How do Distance Vector Routing Protocols determine the best routing path?
How do Distance Vector Routing Protocols determine the best routing path?
What issue can arise with Distance Vector Routing Protocols when a route becomes unavailable?
What issue can arise with Distance Vector Routing Protocols when a route becomes unavailable?
What is the primary method of communication for Distance Vector Routing Protocols?
What is the primary method of communication for Distance Vector Routing Protocols?
What challenge does using dynamic routing protocols present regarding router resources?
What challenge does using dynamic routing protocols present regarding router resources?
Which of the following is NOT a characteristic of Distance Vector Routing Protocols?
Which of the following is NOT a characteristic of Distance Vector Routing Protocols?
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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 Routing Protocols
- 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:
enableconfiguration terminalrouter ripnetwork 192.168.2.0network 192.168.1.0
- Router 2:
enableconfiguration terminalrouter ripnetwork 192.168.2.0network 192.168.3.0network 192.168.5.0
- Router 3:
enableconfiguration terminalrouter ripnetwork 192.168.3.0network 192.168.4.0
- Router 1:
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:
enableconfiguration terminalrouter eigrp 100network 192.168.2.0network 192.168.1.0no auto-summary
- Router 2:
enableconfiguration terminalrouter eigrp 100network 192.168.2.0network 192.168.3.0network 192.168.5.0no auto-summary
- Router 3:
enableconfiguration terminalrouter eigrp 100network 192.168.3.0network 192.168.4.0no auto-summary
- Router 1:
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