Fichas
Routing
Fichas del conjunto (30)
- 1What are the three tables that EIGRP uses? And what do they do?Route table - stores the best route to each remote network the router knows about (successor)
Topology table - stores known, valid, loop-free paths to remote destinations (feasible successor)
Neighbour table - EIGRP neighbours - 2Are routes just stored in the route table?no they entries in the topology table as well
- 3What is the definition of split horizon?dictates that a router cannot advertise a route back out of the same interface upon which it was originally learned
- 4What is the MG analogy of split horizon?Walking through a fire door, you found the route but you can't open the door back up to tell anyone else about it.
- 5what is the command for activating split horizon?conf t
ip split-horizon eigrp AS_Number - 6how would you debug 'Hello' messages?debug ip eigrp packets
- 7What packets are sent when the Successor path has been lost? and what state does the router go into?The router will start sending QUERY packets to other routers for the path that it has lost, to find another way. That is ACTIVE STATE
- 8Following on from above. Once it finds a route? what state does it go into?Weirdly it goes into PASSIVE state, which is weird as it's now able to route
- 9What kind of packet notifies the QUERY packet about the new route?REPLY packet
- 10What protocol allows for a guaranteed and reliable delivery of EIGRP packets?RTP
- 11What does RTP stand for?Reliable Transport Protocol
- 12Why are REPLY packets good?They are returning route information
- 13Do Hello & Timer packets use RTP?No, therefore are unrealiable
- 14When viewing the 'debug ip eigrp packets' logs, in what state is the network stable?When the query, update & reply packets stay the same.
- 15What kind of Hello packet carries no data?ACK (Acknowledgment)
- 16If you see your QUERY, UPDATE and REPLY packets increment, what potential issue could this be pointing towards?Flapping link in the network
- 17What command will show you the amount of received and transmitted packets for UPDATE, QUERY etc?sh ip eigrp traffic
- 18What command allow you to view the EIGRP routes?sh ip route eigrp
- 19what command allows all interfaces to participate in EIGRP? full command must be given with conf tconf t
router eigrp 100
network 0.0.0.0 - 20What steps are in a three way handshake?SYN
ACK & SYN
ACK - 21What is flow control & windowing?Window is the negotiated byte size the rx can take in before it must send an ACK.
The window size is dynamic - 22What is sliding window?If the rx realizes it can handle the initial amount sent comfortably it can ask to increase the window
- 23What is the command for editing the tcp window-size? What does it need to work?ip tcp window-size
needs configuring on both sides of the link to work - 24What are three properties of EIGRP?1. Distance Vector protocol
2. A classless routing protocol
3. Cisco proprietary - 25What are the three routing protocol categories and provide examples?Link State - OSPF
Distance Vector - RIP
Advanced Distance Vector - EIGRP - 26what's the difference in knowledge of neighbors between OSPF and EIGRP?OSPF knows everything in it's area
EIGRP knows what it's connected to - 27Once RIP learns a route, what does it then need to do?Keep on learning the route in case something changes
- 28What is another term for subnet mask in EIGRP?IP Prefix
- 29EIGRP uses DUAL, what is DUAL?Diffusing Update Algorithm
- 30What are the three main things DUAL does?1. determine the best loop-free path
2. determine the backup, loop-free path
3. provide FAST convergence
Información
- Descripción
- CCNP R&S Fichas sobre Routing, creado por Michael Gleeson el 16/01/2018.
- Creado por
- Michael Gleeson
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