Podcast
Questions and Answers
What is the primary function of dynamic routing protocols like EIGRP, RIP, and OSPF?
What is the primary function of dynamic routing protocols like EIGRP, RIP, and OSPF?
- To enable routers to communicate and dynamically update routing information. (correct)
- To ensure that only the most efficient routes are used for data transmission.
- To manually configure static routes for all networks.
- To establish formal adjacencies with neighbors to maintain a central routing table.
How does EIGRP differ from traditional distance-vector routing protocols?
How does EIGRP differ from traditional distance-vector routing protocols?
- EIGRP uses a centralized routing table, while distance-vector protocols use a distributed table.
- EIGRP utilizes a hybrid approach, combining elements of both distance-vector and link-state protocols. (correct)
- EIGRP is more efficient than distance-vector protocols in handling network changes and updates.
- EIGRP uses a more secure authentication mechanism than distance-vector protocols.
Which of the following accurately describes EIGRP's primary characteristic in terms of information dissemination?
Which of the following accurately describes EIGRP's primary characteristic in terms of information dissemination?
- EIGRP uses a hierarchical approach, with designated routers collecting and distributing routing information.
- EIGRP builds a complete network map and distributes it to all routers, like link-state protocols.
- EIGRP uses a broadcast approach to distribute routing information to all connected routers.
- EIGRP relies primarily on neighbor-to-neighbor information exchange, similar to distance-vector protocols. (correct)
What is the significance of EIGRP establishing formal adjacencies with neighboring routers?
What is the significance of EIGRP establishing formal adjacencies with neighboring routers?
How does EIGRP handle route updates when a neighboring router goes down?
How does EIGRP handle route updates when a neighboring router goes down?
Which of the following is a key advantage of EIGRP over traditional distance-vector protocols?
Which of the following is a key advantage of EIGRP over traditional distance-vector protocols?
Which layer of the OSI model does EIGRP primarily operate on?
Which layer of the OSI model does EIGRP primarily operate on?
Why is EIGRP considered a hybrid routing protocol?
Why is EIGRP considered a hybrid routing protocol?
What multicast destination address does EIGRP primarily use?
What multicast destination address does EIGRP primarily use?
What is the protocol number that EIGRP uses at layer 4?
What is the protocol number that EIGRP uses at layer 4?
Which routing protocol has the lowest administrative distance among RIP, OSPF, and EIGRP?
Which routing protocol has the lowest administrative distance among RIP, OSPF, and EIGRP?
When multiple routing protocols learn about the same network, which factor determines which routing source is trusted?
When multiple routing protocols learn about the same network, which factor determines which routing source is trusted?
RIP has an administrative distance of which value?
RIP has an administrative distance of which value?
At what layer does EIGRP communicate using its own protocol instead of TCP or UDP?
At what layer does EIGRP communicate using its own protocol instead of TCP or UDP?
What command can be used to view only OSPF-learned routes on a router?
What command can be used to view only OSPF-learned routes on a router?
Which routing protocol would replace OSPF routes in the routing table if it learns the same routes with a better administrative distance?
Which routing protocol would replace OSPF routes in the routing table if it learns the same routes with a better administrative distance?
The administrative distance of OSPF is set to which of the following values?
The administrative distance of OSPF is set to which of the following values?
What is a characteristic of EIGRP regarding route convergence?
What is a characteristic of EIGRP regarding route convergence?
Why was the packet destined for 8.8.8.8 dropped by Router 2?
Why was the packet destined for 8.8.8.8 dropped by Router 2?
What is the purpose of a default route in this scenario?
What is the purpose of a default route in this scenario?
What command was used to configure the default route on Router 2?
What command was used to configure the default route on Router 2?
Which of the following statements is true regarding the ping operation after configuring the default route on Router 2?
Which of the following statements is true regarding the ping operation after configuring the default route on Router 2?
What is the role of Network Address Translation (NAT) in this scenario?
What is the role of Network Address Translation (NAT) in this scenario?
Which of these options represent the correct sequence of events that occurred when the client attempted to ping 8.8.8.8 after configuring the default route on Router 2?
Which of these options represent the correct sequence of events that occurred when the client attempted to ping 8.8.8.8 after configuring the default route on Router 2?
What would have happened if Router 3 did not have a default route configured?
What would have happened if Router 3 did not have a default route configured?
Which of the following best describes the purpose of Border Gateway Protocol (BGP)?
Which of the following best describes the purpose of Border Gateway Protocol (BGP)?
What causes a route learned via EIGRP to replace an OSPF route in the routing table?
What causes a route learned via EIGRP to replace an OSPF route in the routing table?
When a static route with an administrative distance of 89 is added, how does it affect the routing table containing an EIGRP-learned route?
When a static route with an administrative distance of 89 is added, how does it affect the routing table containing an EIGRP-learned route?
What type of metric does EIGRP use to determine the best route?
What type of metric does EIGRP use to determine the best route?
Which statement is true regarding administrative distances in routing protocols?
Which statement is true regarding administrative distances in routing protocols?
When the routing protocol fails to find a route to a destination, what is the likely response?
When the routing protocol fails to find a route to a destination, what is the likely response?
What must be set up for private addresses to communicate with the internet?
What must be set up for private addresses to communicate with the internet?
If an OSPF route has a lower cost than an EIGRP route, which route will be preferred in the routing table?
If an OSPF route has a lower cost than an EIGRP route, which route will be preferred in the routing table?
In a scenario where multiple routes exist for the same destination, what takes precedence in determining which route enters the routing table?
In a scenario where multiple routes exist for the same destination, what takes precedence in determining which route enters the routing table?
What is the default administrative distance of a static route?
What is the default administrative distance of a static route?
Which command would you use to check for OSPF learned routes in the routing table?
Which command would you use to check for OSPF learned routes in the routing table?
Study Notes
EIGRP Overview
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EIGRP stands for Enhanced Interior Gateway Routing Protocol, a routing protocol developed by Cisco Systems in the 1990s to improve routing efficiency and scalability.
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This combination of distance-vector protocol characteristics, such as quick convergence and hop-count-based routing decisions, and link-state protocol features, like maintaining a comprehensive network topology map, enables EIGRP to efficiently adapt to changing network conditions. In distance-vector protocols, routing decisions are primarily based on the number of hops (or intermediate networks) between the source and destination nodes. This approach allows EIGRP to rapidly adjust to new network topologies after links fail or become unavailable.
One of the key benefits of this architecture is that EIGRP can quickly reconverge the network and establish new routes after a link failure. This is particularly important in networks with high availability requirements, such as those supporting mission-critical applications. Additionally, EIGRP's ability to detect and prevent routing loops helps to ensure the network remains stable and data is delivered reliably.
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The establishment of formal adjacencies with neighbors is a key feature of EIGRP, enabling it to maintain a map of the routing topology and detect changes in the network.
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The use of rumored information from its next neighbor helps EIGRP to speed up the convergence process and reduce the amount of routing information that needs to be exchanged between neighbors.
Layer 3 and 4 Operations
- EIGRP uses a multicast layer 3 destination address of 224.0.0.10
- It has the ability to do some unicast traffic as well
- At layer 4, it doesn't use TCP, UDP, or GRE; instead, it uses its own protocol with a decimal value of 88
Administrative Distance
- EIGRP has an administrative distance of 90
- The routing protocol with the lowest administrative distance is considered more trusted and will be used in the routing table
- RIP has an administrative distance of 20, OSPF has an administrative distance of 110, and EIGRP has an administrative distance of 90
Metric and Composite Metric
- EIGRP uses a composite metric to calculate the best path
- The composite metric is used to make differentiating decisions on the best path once routes are in the routing table
- EIGRP metric values may seem large, but they are not directly comparable to OSPF metrics
Route Selection and Replacement
- When a route is learned via multiple sources, the route with the lowest administrative distance is used in the routing table
- If a route is learned via EIGRP and OSPF, the EIGRP route will be used due to its lower administrative distance
- A static route with a lower administrative distance can replace an EIGRP-learned route
Dynamic Routing and Static Routes
- Dynamic routing protocols allow routers to dynamically update each other about network reachability
- EIGRP is one of the fastest routing protocols to converge
- Static routes can be used in conjunction with dynamic routing protocols, but may be replaced by dynamically learned routes if the administrative distance is higher
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Description
Learn about the Enhanced Interior Gateway Routing Protocol (EIGRP) in this video, including its highlights and a quick demo. Discover how it compares to other dynamic routing protocols.
