Podcast
Questions and Answers
What is the term used to refer to the tree built by reverse path forwarding in routing?
What is the term used to refer to the tree built by reverse path forwarding in routing?
- A multicast tree for group 1
- A network
- A multicast tree for group 2
- A sink tree (correct)
In multicast routing for group 1, what type of tree is commonly used?
In multicast routing for group 1, what type of tree is commonly used?
- A network
- A spanning tree for the leftmost router
- A multicast tree for group 1 (correct)
- Anycast routes to group 1
What is the purpose of core-based trees in multicast routing?
What is the purpose of core-based trees in multicast routing?
- Sending to group 1 (correct)
- Building spanning trees for routers
- Finding optimal paths in ad hoc networks
- Anycast routes to group 1
Which term describes the method used for packet routing in mobile hosts?
Which term describes the method used for packet routing in mobile hosts?
In the context of routing in ad hoc networks, what do the solid lines represent?
In the context of routing in ad hoc networks, what do the solid lines represent?
What is the primary functionality of anycast routing?
What is the primary functionality of anycast routing?
What is one key difference between nonadaptive and adaptive routing algorithms?
What is one key difference between nonadaptive and adaptive routing algorithms?
What is the responsibility of the routing algorithm in the network layer?
What is the responsibility of the routing algorithm in the network layer?
When does a routing decision need to be made for datagram networks?
When does a routing decision need to be made for datagram networks?
In the context of routing algorithms, what does static routing primarily focus on?
In the context of routing algorithms, what does static routing primarily focus on?
What is the characteristic of session routing in virtual circuit networks?
What is the characteristic of session routing in virtual circuit networks?
What determines the usefulness of static routing in a network?
What determines the usefulness of static routing in a network?
Why are correctness, simplicity, robustness, stability, fairness, and efficiency desirable in routing algorithms?
Why are correctness, simplicity, robustness, stability, fairness, and efficiency desirable in routing algorithms?
What information do dynamic routing algorithms utilize for making routing decisions?
What information do dynamic routing algorithms utilize for making routing decisions?
The optimality principle in routing algorithms states that:
The optimality principle in routing algorithms states that:
In network design, why can fairness and efficiency be contradictory goals?
In network design, why can fairness and efficiency be contradictory goals?
In dynamic routing algorithms, what metric can be used for optimization besides distance?
In dynamic routing algorithms, what metric can be used for optimization besides distance?
How are routing algorithms classified based on their adaptability?
How are routing algorithms classified based on their adaptability?
Study Notes
Routing Algorithms
- Nonadaptive algorithms do not base their routing decisions on any measurements or estimates of the current topology and traffic.
- Nonadaptive algorithms compute the route in advance, offline, and download it to the routers when the network is booted.
- This procedure is sometimes called static routing.
- Static routing is mostly useful for situations in which the routing choice is clear.
Adaptive Algorithms
- Adaptive algorithms change their routing decisions to reflect changes in the topology and traffic.
- Adaptive algorithms differ in where they get their information, when they change the routes, and what metric is used for optimization.
- Optimization metrics include distance, number of hops, or estimated transit time.
The Optimality Principle
- The optimality principle states that if router J is on the optimal path from router I to router K, then the optimal path from J to K also falls along the same route.
- The optimality principle was first described by Bellman in 1957.
Routing Algorithm Properties
- Correctness, simplicity, robustness, stability, fairness, and efficiency are desirable properties in a routing algorithm.
- Fairness and efficiency may sound obvious, but they are often contradictory goals.
Types of Routing
- Hierarchical routing involves routing tables and normal operation is resumed after installation.
- Broadcast routing uses reverse path forwarding.
- Multicast routing involves building a tree for the group.
- Anycast routing involves routing to a group of nodes.
- Routing for mobile hosts involves packet routing.
- Routing in ad hoc networks involves discovering routes and responding to failures.
Specialized Routing
- Session routing involves making routing decisions only when a new virtual circuit is being set up.
- Datagram networks make routing decisions anew for every arriving data packet.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the concept of nonadaptive algorithms known as static routing in computer networks. Learn about how routing decisions are computed in advance and downloaded to routers at boot, as well as the limitations and use cases of static routing.
