OSPF & ISIS Fundamentals & BGP Overview
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| OSPF routers elect one special router and a backup one known as? | Designated Router (DR)
Designated Backup Router (DBR)
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| What two Link State Advertisements are limited to flooding within the originating area? | LSA 1 - Router LSA
LSA 2 - Network LSA
Both limited to flooding within the origination area.
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| What two LSA's can flood to external areas? | LSA 3 - Network Summary LSA
--Sent by Area Border Router to single attached area
LSA 4 - ASBR Summary LSA
--Sent by Autonomous System Border Router. Advertises exit point of the areas to external areas. Only sent between other ASBRs.
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| What LSA injects prefixes originated from other routing protocols into the OSPF domain? | LSA 5 - External LSA
--Originated by ASBR. Flooded to all areas and all internal routers. Advertise a destination external to the OSPF.
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| What is IP Prefix Redistribution? | Process of inserting routing information into a protocol from outside?
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| How do ISIS routers routing information? | LSPs = Link State PDUs
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| When do routers move from Neighbors to being Adjacent? | Once both LSDs (Link State Databases) are synchronized and identical then the routers become adjacent.
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| What special address is used by ISIS systems? Two general divisions? | NSAP - Network Service Access Protocol
1) IDP = Initial Domain Part
2) DSP = Domain Specific Part
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| 3 Parts of simplified NSAP Address? | Area ID - Identifies area that IS belongs to
SysID = Identifies IS System itself
NSEL = NSAP Selector = Similar to TCP/UDP Port #
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| What is BGP? | An inter-Autonomous System routing protocol
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| When is i-BGP applicable? | When BGP is used to connect other BGP routers within the same autonomous system. If BGP routers are in different systems, e-BGP is used.
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