Flashcards in chapter 6 Deck (29):
what mac address is used as the multi-area address on ethernet/ broadcast networks?
what command is entered on a switch to see the type of (SDM) Switch Database Management
show sdm prefer
(land-base routing, etc)
what command is entered on a switch to see the type/ model device being used?
what should be used instead of the command 'ping' to test connectivity on a network?
how do u use an extended ping?
you use the source address of where u are sending the ping from as the source address. this way the ping is not sent from the destination routers interface ip address and is more accurate in testing connectivity.
what is SPI?
security policy index
what is default originate?
in OSPF what is a regular area?
a non-backbone area. used to connect end users. does not allow traffic from a diff. area o travel through this area to get to a destination, instead this other area must travel through a backbone or area 0. regular area can have subtypes.
in ospf what is a backbone area?
area 0: transit area. function is to quickly move ip packets. used to connect regular (non-backbone) areas to one another.
what are the 4 types of OSPF routers?
area boarder router (ABR)
autonomous system boundry router (ASBR)
what does the internal router do?
all of its interfaces are in the same area and have identical LSDB (link state databases)
what is the purpose of a backbone router?
router(s) is set to 0. the router is responsible for moving ip packets between network areas and is a router inside area 0 (the backbone).
what is the purpose of the ABR?
Area Boarder Router- a router that is at the boarder of one area and is connected to another area like area 0. this router maintains (LSDB)'s link state databases for each area that is connected. route summerization can be configured for each area within the ABR.
what is a ASBR?
Autonomous System Boundry Router: has at least 1 interface attached to an external internetwork (such as a non-ospf network)
what are the main 5 types of LSA?
link state advertisement types:
1- Router LSA
2- Network LSA
3 and 4-Summary LSA
5- External LSA
what is the LSA type 1?
Router LSA: all routers generate this in an ospf network. flooded within an area but do not go beyond the ABR. *all directly connected OSPF enabled links are advertised in a type 1 LSA and forward network info to other OSPF neighbors.
what are router link entries? what type of LSA?
LSA type 1. a list of directly connected interfaces, link types and link states.
what is a type 1 LSA?
Type 1 LSAs include a list of directly connected network prefixes and link types.
All routers generate type 1 LSAs.
Type 1 LSAs are flooded within the area and do not propagate beyond an ABR.
non-broadcast multiaccess -such as a serial link connected area like area 0
what is a type 2 LSA?
The purpose of a type 2 LSA is to give other routers information about multiaccess networks within the same area...
**the LSA type 2 is created by the DR in a single area then sent to all other routers within that same area and not beyond. the LSA-2 has the DR router id and ip address, also has the router id's of all other routers on the multiaccess segment. **2 routers and a DR is needed for LSA-2 to be made.
what is a type 3 LSA?
A link state advertisement that is used by ABR's to advertise networks from other areas. every ospf route on an ABR gets a type 3 LSA and this can cause flooding issues if many network exist. (summerization recommended)
how are type 3 LSA identified?
by the network address.
what is a type 3 LSA?
A link state advertisement that is used by ABR's to advertise networks from other areas. every ospf route on an ABR gets a type 3 LSA and this can cause flooding issues if many network exist. (summerization recommended). *routes are added to a routers routing table without the SPF algorithm running.
type 4 LSA?
used to advertise the ASBR to other areas and provide a route to the ASBR. *regenerated by other ABR's to pass on the LSA-4 .**identified by the router ID of the ASBR
type 4 LSA?
used to advertise the ASBR to other areas and provide a route to the ASBR. *regenerated by other ABR's to pass on the LSA-4 .**identified by the router ID of the ASBR. --the ASBR sends out a LSA-type 1 with a character 'e' that then the ABR receives and produces a LSA type 4 that is sent out to all the other ABR's and they regenerate this LSA type 4.
type 5 LSA?
the ASBR advertise external non-ospf network addresses to all the routers in the ospf network. (ABR's in the network regenerate the LSA type 5 and sends them to other routers in the network) The link-state id is the external network number.
what type of LSA is: autonomous system external LSA entries?
what is a multiaccess network>?
multiaccess as any network segment on which a DR needs to be elected