MODULE 6 Section 1 Flashcards
(44 cards)
OSI Routing Protocols
Osi network layer protocols:
->
->
OSI network Entities
->___, ___, _____, and ____
End System-to Intermediate System (ES-IS)
Intermediate System-to-Intermediate System
Host, Area, Backbone, and Domain
ES-IS discovery protocol:
Analogous to the _____ _____ ____ in __, performs ____ between ____ and ________, referred as ______.
Analogous to the address resolution protocol, performs routing between End Systems and Intermediate Systems, referred as Level 0 routing.
IS-IS routing protocols Performs \_\_\_\_\_ (\_\_\_\_\_ and \_\_\_\_\_ ) routing between \_\_\_\_\_\_\_\_\_\_.
Performs hierarchical (Level 1 and Level 2 ) routing between intermediate systems.
OSI network entities:
->Domain: Is any portion of an OSI network that is ______ ___ __ _____, know as an _________
->Domain is any portion of an OSI network that is under a common administrative authority, know as an Autonomous System (AS)
OSI network entities:
->Area is a _______ _____; it is formed by a ____ ____ and the ___ ____ ____. All router in the same ____ exchange information about all the routers that they can reach.
-> Area is a logical entity; it is formed by a set of contiguous routers and the data links that connect them. All router in the same area exchange information about all the routers that they can reach.
OSI network entities:
->Backbone connect areas. All routers in the backbone know _______.
->Backbone connect areas. All routers in the backbone know how to reach all areas.
->ES, IS
- > End system: non router host, node
- >IS : Router
IS-IS Development
- > Began _____
- > Uses ___________ algorithm
- > Supports_______
- > Many large enterprise networks and ISP use ISIS because: ________ and ________ of the protocol
- > Same time as OSPF
- > Dijkstra
- > IPv6
- > Scalability, stability
IS-IS Development
- > ISO ____
- > Initial implementation was completed by _____ in ___s
- > The IS-IS working group of the IETF so that ____ __ ____ and____ ____ _____
- > This form is called ______, (or ____) RFC _______.
- > 10589
- > DEC, late 1970s
- > Carry IP reachability information, compute the best path to a IP destinations
- > Integrated, Dual 1195.
IS-IS RFC History
1990 ->____RFC …. -> …. ___/__ ______
1992 -> ISO ……
2002-> RFC …. ___ ____ _____
- > Original RFC 1142, 1195 TCP/IP support
- > ISO 10589
- > RFC 3359 TLV code points
IS-IS Protocol Overview
->Link-State driven updates, periodic hellos
->Link state protocol triggers and update when a link (interface) changes state. The router connected to the link initiates a triggered update to its neighbors, notifying of the topology change.
IS-IS Protocol Overview
-> Authentication
Ensuring that accurate network topologies are created without false information or errros
IS-IS Protocol Overview
- > Level 1 and Level 2 hierarchy: IS-IS support ____ASs using ___ level of hierarchy
- Level 1 routing is performed ___ a ___ ____
- Level 2 routing is performed _____ ______
IS-IS supports large AS’s using tow level of hierarchy. Level 1 routing is performed within a single area.
Level 2 routing is performed between areas.
IS-IS Protocol Overview
- >
- >
- >
- >
- >
- >
IS-IS Protocol Overview
- > Link-State driven updates, periodic hellos
- > Classless routing protocol
- > Subnet mask, sent in update
- > VLSM, CIDR, and route summarization
- > Authentication
- > Level 1 and Level 2 hierarchy
IS-IS uses significantly fewer links-state PDU than OSPF
- > _____ reside ________
- > ISIS is more _____
- > More routers reside in a single area
- >ISIS more scalable
IS-IS Protocol overview cont’d
- > Maintenance of ______
- > S
- > S
- > F
- > O
- > L
IS-IS is favored in in ISP environments
Link State protocol comparison
- > Multicast Layer
- > Metric
- > Updates tipes
- > Area Hierarchy
- > Area bundaries
- > L2 - L3
- > 10 - Autocalculation
- > L1 L2 - Multiple
- > not required - Backbone area
- > Link ( Segments) - Routers (Interfaces)
TERMS
- > Host
- > Router
- > Subnet
- > LSA
- > DBDP
- > ACK
- > DR
- > Interface adress
TERMS
- > End system
- > Intermediate system
- > Cirucuit
- > LSP
- > Complete sequence number CSNP
- > Partial sequence number
- > Designated IS
- > Network Service Access Poin
-> End system: deliver or receive but not ___
-> Relay
-> Intermediate System:
____ and ____ PDUs from other systems, and ____ PDUs from other source systems to other destination systems.
They ____ ____ to systems within their own area, and ____ _____ a ______ _ intermediate system when the destination system is in a different area.
Intermediate Systems — Deliver and receive PDUs from other systems, and relay PDUs from other source systems to other destination systems. They route directly to systems within their own area, and route towards a level 2 intermediate system when the destination system is in a different area.
- Link State PDU (LSP)
- Contains ___ __ ________ about one router, such as its _____ __ _____, ___ _____, and so on. There is ______ per router
-Contains all the information about one router, such as its connected IP prefixes, area addresses, and so on. There is one LSP per router.
Partial Sequence Number PDU (PSNP)
-> Used for ______ and ______ the link state information.
-> Used for requesting and confirming the link state information.
Complete Sequence Number PDU (CSNP)
-> Used for _____ the _____ _____ _____ ______
-> Used for distributing the complete link state database
IS-IS Level 1, Level 2 and Level 1/2 IS’s
- > Highly S____ (_____ ____ __ ___)
- > Level 1 routers exchange topology ________
- > Level 2 routers exchange topology ________
- > Level 1/2 routers exchange topology ________
IS-IS Level 1, Level 2 and Level 1/2 IS’s
- > Highly scalable (1000 routers per Area)
- > Level 1 routers exchange topology for the local area
- > Level 2 routers exchange topology between different areas
- > Level 1/2 routers exchange topology between level 1 and level 2 routing domains
