Terminology 4 Flashcards
AD is used to rate what?
The trustworthiness of routing information.
What are the minimum and maximum AD?
0, 255
What does an AD of 255 mean?
No traffic is allowed to be passed via this route.
What happens when multiple routing protocols are running on a router?
Only the routes from the protocol with the lowest default AD will be on the routing table.
What is the default AD for connected interfaces?
0
What is the default AD for static routes?
1
What is the default AD for External BGP?
20
What is the default AD for Internal EIGRP?
90
What is the default AD for IGRP?
100
What is the default AD for OSPF?
110
What is the default AD for IS-IS?
115
What is the default AD for RIP?
120
What is the default AD for External EIGRP?
170
What is the default AD for Internal BGP?
200
What is the default AD for unknown?
255
What three tables do Link State routing protocols keep?
- Directly attached neighbours
- Topology of the entire network
- The actual routing table
When distance vector routing protocols pass their routing tables to their neighbours, what is this known as?
Routing by rumour.
If two routes are received with the same AD, how does the protocol choose a route?
The protocol uses other metrics.
In DV routing, if the AD is the same and the hop count is the same, what does the router do?
It uses round-robin load balancing.
What normally happens to data transmission when routers are converging?
It stops
How often does RIP send out a complete routing table to all active interfaces?
Every 30 seconds.
What is RIP’s maximum allowable hop count
15
Why does RIP limit the allowable hop count to 15?
To prevent routing loops.
Why can RIP cause latency in a network?
Slow convergence.
Does RIP support classful routing?
No, all devices must use the same subnet mask for each specific address class.
Why is RIPv2 considered classless?
Because subnet information is sent with each route update.
Is RIP open standard or proprietary?
Open standard.
RIPv1 uses broadcasts to send routing information to neighbours. What does RIPv2 use (and what address)?
Multicast 224.0.0.9
What authentication do RIP and RIPv2 support?
RIP - none
RIPv2 - MD5
Do RIP and RIPv2 support VLSM?
RIP - no
RIPv2 - yes
What 3 routing protocols send subnet mask information with route updates?
RIPv2
OSPF
EIGRP
What is a discontiguous network?
One that has two or more subnets of a classful network connected together by different classful networks
Discontiguous networks work with which protocol?
OSPF
What is route aggregation?
Combining multiple subnets into one larger subnet.
What is another name for route aggregation?
Supernetting.
What link-state characteristic does EIGRP have, making it a hybrid protocol?
It synchronises routing tables between neighboursat startup, and then only sends specific updates only when topology changes occur.
Does EIGRP support IPv6?
Yes, EIGRPv6 does
Does EIGRP support summaries and discontiguous networks?
Yes
With EIGRP, what is RTP?
Reliable Transport Protocol
What is DUAL?
Diffusing Update Algorithm