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31 Cards in this Set

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  • Back
EIGRP: What is the address for Hello messages?
Multicast: 224.0.0.10
EIGRP: What transport protocol is used to send update messages?
RTP - Reliable Transport Protocol
EIGRP: How are EIGRP routes denoted in the routing table?
With a "D"
EIGRP: What is the feasible distance?
The metric of the best route to a subnet
EIGRP: What is the reported distance?
The metric calculated on a neighboring router and sent in an EIGRP update
EIGRP: What is a successor?
The path with the lowest overall feasible distance. Best route to a subnet.
EIGRP: What is a feasible successor?
The backup path if the sucessor goes down. If the RD from a neighbor is less than the FD for a non-successor route, the route is a feasible successor and does not loop.
EIGRP: What algorithm is used to find routes?
DUAL - Diffusing update Algorithm
EIGRP: What is necessary in discontigouous networks?
If you have a discontiguous network, you must turn off route summarization because EIGRP summarizes by classful networks.
CLI: #no autosummary.
EIGRP: What metrics are used by default? Possible?
Default: bandwidth and delay
Possible additions: reliability and load, but not MTU
EIGRP: How to enable load balancing over unequal paths?
Set variance. Any path whose FD is less than ( best-path-FD*variance) will be used.
EIGRP: High level overview - 3 major steps in process?
1. Neighbor discovery
2. Topology Exchange uses multicast (no need for DR and BDR)
3. Routing determines successor and feasible successor. Uses DUAL algorithm if both fail.
EIGRP: 3 requirements to become neighbors (Hello)?
1. Same AS number
2. Source IP in neighbor's hello must be in same subnet
3. authenication
EIGRP: CLI commands to configure?
#router eigrp<as number>
#network <ip> <optional wildcard mask>
#network <ip2>…
#no autosummary
EIGRP: optional CLI commands to support multiple routes?
#variance <n>
#maximum paths <n>
EIGRP: interface mode commands to set metrics?
#bandwidth <n>
#delay <n>
EIGRP: CLI command to stop sending on an interface
#passive interface <type number>
(turn off: #no passive interface <type number>)
EIGRP: CLI commands to create a key chain
#key chain <name>
key 1
#key-string <password> [accept lifetime <time>]
repeat last 3 steps to define additional keys
EIGRP: CLI commands to apply keychain to interface
#int <type number> or #vlan <x>
#ip authentication mode eigrp <asn> md5
#ip authentication key-chain eigrp <name>
Key chain authentication: which key is used?
The lowest-numbered currently valid key
Compare EIGRP and OSPF: Metrics
OSPF uses bandwidth
EIGRP uses bandwith + delay (default)
Compare EIGRP and OSPF: route summarization
OSFP has no manual summarizaiton. EIGRP allows for manual summarization at any router
Compare EIGRP and OSPF: Standard or Proprietary?
OSPF is public standard
EIGRP is proprietary
EIGRP: IOS command to view the number of EIGRP packets sent and received
#show ip eigrp traffic
EIGRP: IOS command to set metrics for EIGRP
default-metric
EIGRP: What is the default administrative distance for an EIGRP summary route?
5
EIGRP packet types
Hello
update
query
reply
ack
(check for others)
EIGRP command and mode to configure bandwidth percentage?
interface mode
ip bandwidth-percent eigrp <area> <percent>
IGRP - What factors are used for the metric?
Same as EIGRP (Bandwidth, Delay, Load, Reliability)
Show ip route displays the routing table. What are the meanings of the two numbers shown in brackets after the IP address (i.e. [90,2178765])
Administrative distance and cost
EIGRP: Any update that is sent in the next ___ seconds indicates a topology change.
Trick question. EIGRP only sends updates when the topology changes, so every update represents a topology change.