Module 3 / Unit 1 / Routing Flashcards
What is a directly connected route?
A host or subnet connected to one of the router’s interfaces.
An entry in a routing table will list the destination network address and netmask plus a gateway and metrics. What other piece of information is required
Interface - the local port used to route to the destination.
If a routing protocol carries a subnet mask field for route updates, what feature of IP routing does the routing protocol suppo
Classless addressing (subnetting and supernetting).
True or false? A router would normally have more than one network interface.
True. Routers with a single interface (a “router on a stick”) might be used to route between VLANs though.
What does it mean if a routing protocol converges to a steady state quickly?
Changes to the network topology are propagated between routers quickly. This makes the network quicker and more reliable.
Which general class of dynamic routing protocol provides the best convergence performance?
Link-state.
What routing metric might you prioritize for a VoIP application?
Latency (minimizing delay) is important.
What is an ASN and how does it assist route aggregation?
An Autonomous System Number (ASN) identifies a group of network prefixes under the administrative control of a single entity (such as an ISP). The AS can be advertised to other AS through a single prefix (route aggregation), hiding the complexity of the internal network from other autonomous systems.
When might an Administrative Distance metric be factored into routing decisions?
When a router obtains routes from multiple different routing protocols the AD metric is an index of routing protocol reliability.
What is the purpose of HSRP and VRRP?
Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP) allow multiple physical router appliances to act as the same logical router, providing redundancy, load balancing, and failover.
How would you view the routing table on a Linux PC?
Just enter “route” without any other parameters.
If you receive a “Request timed out” error message when using ping, what would you attempt next?
Use tracert to try to identify the routing problem.
What tool(s) could you use to measure link statistics over time?
pathping or mtr.
What is a looking glass site?
A server allowing third parties to inspect the routing infrastructure of an autonomous system, assisting troubleshooting.
