300-101 Flashcards
By default what percentage of link bandwidth will EIGRP use?
50%
What is the default active timer on modern versions of EIGRP? older versions?
3 minutes / 1 minute
With what does EIGRP seed its routing table before learning topology data from neighbors?
1) All routes on working interfaces with static neighbors defined.
2) All routes redistributed into this router
What is the max size of the standard TCP window
65535 bytes
What command enables TCP window scaling?
R1(config) # ip tcp window-size <0-1073741823> (bytes)
What is TCP selective acknowledgement?
The ability of a recipient to indicate which segments were not received so that the entire window doesn’t need to be resent.
What command enable TCP selective ACK
(config)# ip tcp selective-ack
T/F TCP header compression can be used with TCP timestamps?
False. Header compression must be off to enable TCP timestamps.
What features does PPP offer that HDLC does not?
authentication
error detection
error recovery
What are the phases of a PPPoE session?
1) Active Discovery (client is looking for a server)
2) Session (auth and negotiation take place)
What does the EIGRP network statement without a wildcard mask do?
Uses the default classful mask
What is the default AD for an EIGRP summary route?
5
How do you see the AD of an EIGRP summary route
sh ip route
What types of routes will an EIGRP stub advertise?
connected and summary
What command configures an EIGRP stub router?
(config-router)# eigrp stub [summary] [connected] [static] [redistributed]
How do you make an EIGRP interface passive?
(config-router)# passive-interface
How do you make EIGRP interfaces passive by default?
(config-router)# passive-interface default
What are the EIGRP K-values?
K1 - Bandwidth (kbps)
K2- Load (ratio: 1-255)
K3 - Delay (10’s of microseconds)
K4 - Reliability (ratio: 0-255)
What command changes the EIGRP K values?
(config-router)# metric weights
What is the EIGRP bandwidth command for?
Limits the amount of bandwidth that EIGRP will use for itself.
What is the default EIGRP bandwidth percentage? How do you change it?
1) 50%
2) (config-if)# ip bandwidth-percent eigrp
What are two ways to distribute a default router in EIGRP?
1) Set a static and redistribute static
2) Use ip default-network
What two things, must you do to use the ip default-network feature?
1) Advertise the network you want to be the default
2) use the ip default-network command to make it the default.
How is a DR/BDR election performed?
1) All routers with a priority of 1 or greater are eligible to participate.
2) The router with the highest priority is elected DR.
3) In case of tie, the router with the highest RID wins.
4 ) Process repeats for a BDR.
How is OSPF RID determined?
1) IP of loopback with highest IP address
2) If no loopback, IP of physical interface with highest IP.
Alternatively, can be set with router-id command.
What is the default route type for OSPF route redistribution?
E2 (External type 2)
What is the difference betwen OSPF E1 and E2 routes/
E1’S metric includes the cost from the local router to the desination.
E2’s metric only shows the cost from the ASBR to the destination
What is the default metric type for an OSPF external router?
E2
List the OSPF route selection order
1) Intra area routes
2) Inter area routes
3) E1
4) E2
5) N1
6) N2
What are the two ways to summarize routes in OSPF?
1) On ABR (for inter area) do,
(config-router)# area range
2) On ASBR (for external routes) do,
(config-router)# summary-address
