What are four [4] routing protocol functions
- Discovery of remote networks
- Maintaining up-to-date routing info
- Choosing the best path to destination networks
- Discover new best path if current path disrupted
What are three [3] “pros” for routing protocol functions
- Automatic! Little maintenance and admin overhead required
- Calculate best path
- Help admins manage static routes
What are four [4] “cons” for routing protocol functions
- CPU and memory usage can be high
- Network bandwidth usage
- Less secure- chats w/ each other can be intercepted
- Experienced admins required
What is convergence?
When all routers have complete and accurate info about the entire network
What is convergence time?
- Convergence time = time it takes to achieve convergence
2. Is a function of update frequency and time for algorithm calculation
What is IGP? (Interior Gateway Protocol)
Used for routing WITHIN an autonomous system (RIP, EIGRP, OSPF, IS-IS)
What is EGP? (Exterior Gateway Protocol)
Used for routing BETWEEN autonomous system (BGP)
What is DV (Distance Vectoring) ?
protocols use limited pointers to distance networks
What is LS (Link State) ?
LS protocols have complete knowledge of entire network and all routers have the same map
What are two [2] link state protocols?
- OSPF (Open Shortest Path First)
2. IS-IS (intermediate System to Intermediate System)
What is a Classful Routing Protocols?
Classful routing protocols do not send subnet masks in their routing updates
What are three [3] issues with Classful Routing Protocols?
- Only RIPv1 and IGRP are classful
- Do not support VLSM and CIDR
- Create problems with discontiguous networks
What is a Classless Routing Protocols?
Classless routing protocols include subnet masks in routing updates
What are three [3] “Pros” for Classless Routing Protocols?
- RIPv2, EIGRP, OSPF and IS-IS
- Support VLSM and CIDR
- IPv6 routing protocols
What is a Metric Routing Protocol?
Metric = value assigned by the routing protocol to measure routes
What are two [2] reason matric Routing Protocol are used?
- Best path based on the route with the lowest cost
2. Lower is better!
What are eight [8] Distance Vector Technologies?
- Share updates between neighbours
- Not aware of the network topology
- Send periodic broadcast updates even if topology has not changed
- Updates use bandwidth and resources
- IPv2 and EIGRP use multicasts
- EIGRP uses triggered update only
- RIP – Bellman-Ford algorithm
- IGRP and EIGRP use the Diffusing Update Algorithm (DUAL)
What is RIP (Routing Information Protocol)?
distance-vector routing protocols, which employs the hop count as a routing metric.
What is RIP (Routing Information Protocol) maximum hop count?
15
What are three [3] Algorithms
- Bellman-Ford
- DAUL (Diffusing Update ALgorithm)
- Dijkstra (SPF)
What is EIGRP (Enhanced Interior-Gateway Routing Protocol)
an advanced distance-vector routing protocol that is used on a computer network to help automate routing decisions and configuration. The protocol was designed by Cisco Systems as a proprietary protocol, available only on Cisco routers, but Cisco converted it to an open standard in 2013.
What are five [5] LS Protocols Converge
- Each router learns about its own directly connected networks
- Routers exchange hello packets to “meet” other connected routers
- Each router builds its own Link State Packets(LSPs)
- LSPs are flooded to all neighbours who store and forward them
- Once all routers have received all LSPs. The routers construct a topological map which is used to determine the best routes
What is Level 1 routing table structure?
Cisco routing table is hierarchical (speeds up look up process)
