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Advanced Routing
CCNA 5
26
Computer Networking
Undergraduate 4
08/26/2014

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Cards

Term
standard area
Definition
This default area type accepts link updates, route summaries, and external routes.
Term
backbone area
Definition
labeled area 0, and all other areas connect to this area to exchange and route information. Has all the properties of a standard OSPF area.
Term
stub area
Definition
This area type does not accept information about routes external to the autonomous system, such as routes from non-OSPF sources. If routers need to route to networks outside the autonomous system, they use a default route, indicated as 0.0.0.0.
Term
totally stubby areas
Definition

This Cisco proprietary area type does not accept external autonomous system routes or summary routes from other areas internal to the autonomous system. If a router needs to send a packet to a network external to the area, it sends the packet using a default route. Cannot contain ASBRs (except that the ABRs may also be ASBRs).

 

 

Term
NSSA
Definition
This area type defines a special LSA type 7. Offers benefits that are similar to those of a stub area. They do not accept information about routes external to the autonomous system, but instead use a default route for external networks. Allow ASBRs, which is against the rules in a stub area.
Term
Totally stubby NSSA
Definition
allows ASBRs, but does not accept external routes or summary routes from other areas. A default route is used to get to networks outside of the area
Term
stub area chart
Definition

LSA's allowed 1,2,3

 

LSA's blocked 4,5

 

No ASBR

 

 

 

Term
Totally stubby chart
Definition

LSA's allowed 1,2,3(default route)

 

LSA's blocked 3,4,5

 

No ASBR

Term
NSSA chart
Definition

LSA's allowed 1,2,3,7

 

LSA's blocked 5

 

ASBR: yes

Term
totally stubby NSSA
Definition

LSA's allowed 1,2,7

 

LSA's blocked 3,5

 

ASBR: yes

Term
stub area routing table codes
Definition
O, OIA, O*IA
Term
Totally stubby NSSA routing codes
Definition
O, O*IA, ON1
Term
TOTALLY STUBBY ROUTING CODES
Definition
O, O*IA
Term
NSSA routing codes
Definition
O, OIA, ON1, ON2
Term
show ip protocols
Definition
displays ospf process ID, router ID, advertised networks, AD, maximum paths, number of areas in the router and the reference bandwith
Term
show ip ospf neighbor
Definition
displays ospf neighbor relationships. shows neighbor ID, priority, state, dead timer, interface ip address of neighbor router and the interface used to reach the neighbor
Term
show ip ospf
Definition
displays ospf process ID, router ID, ospf area information and the last time the SPF algorithm was calculated
Term
show ip ospf interface ethernet f0/0
Definition
displays router ID, network type, DR/BDR information, Cost, hello/dead timers, adjacent neighbors, router state
Term
router advertisement (RA)
Definition
sent by an IPv6 router to the all IPv6 devices multicast. Includes link info such as prefix, prefix-length, and default-gateway
Term
router solicitation (RS)
Definition
sent by a device to the all IPv6 routers multicast to request a RA message from the router
Term
neighbor solicitation (NS)
Definition
sent by a device to the solicited node multicast address when it knows the IPv6 address of a device but not its MAC
Term
neighbor advertisement (NA)
Definition
sent by a device in response to a NS message
Term
PPP
Definition
a layer 2 encapsulation that supports various Layer 3 protocols including IPv4 and IPv6
Term
antireplay protection
Definition
verifies that each packet is unique and not duplicated
Term
TCP Maximum Segment Size (MSS)
Definition
defines the largest amount of data that the receiving device is able to accept in a single TCP segment
Term
Path MTU Discovery (PMTUD)
Definition
developed for the purpose of determining the lowest MTU along a path from the packet's source to destination
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