Difference between revisions of "CCNA Explorer 2 Introduction to Routing and Packet Forwarding"
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==Path Determination and Switching Functions== | ==Path Determination and Switching Functions== | ||
===Packet Fields and Frame Fields=== | ===Packet Fields and Frame Fields=== | ||
+ | {| | ||
+ | |[[Image:ScreenShot714.jpg|800px|left|thumb|IP Packet Header]] | ||
+ | |- | ||
+ | | | ||
+ | *'''Version''' - Version number (4 bits); predominant version is IP version 4 (IPv4) | ||
+ | *'''IP header length''' - Header length in 32-bit words (4 bits) | ||
+ | *'''Precedence and type of service''' - How the datagram should be handled (8 bits); the first 3 bits are precedence bits (this use has been superseded by Differentiated Services Code Point [DSCP], which uses the first 6 bits [last 2 reserved]) | ||
+ | *'''Packet length''' - Total length (header + data) (16 bits) | ||
+ | *'''Identification''' - Unique IP datagram value (16 bits) | ||
+ | *'''Flags''' - Controls fragmenting (3 bits) | ||
+ | *'''Fragment offset''' - Supports fragmentation of datagrams to allow differing maximum transmission units (MTUs) in the Internet (13 bits) | ||
+ | *'''Time to Live (TTL)''' - Identifies how many routers can be traversed by the datagram before being dropped (8 bits) | ||
+ | *'''Protocol''' - Upper-layer protocol sending the datagram (8 bits) | ||
+ | *'''Header checksum''' - Integrity check on the header (16 bits) | ||
+ | *'''Source IP address''' - 32-bit source IP address (32 bits) | ||
+ | *'''Destination IP address''' - 32-bit destination IP address (32 bits) | ||
+ | *'''IP options''' - Network testing, debugging, security, and others (0 or 32 bits, if any) | ||
+ | |- | ||
+ | |[[Image:ScreenShot715.jpg|800px|left|thumb|Ethernet Frame Header]] | ||
+ | |} | ||
+ | ===Best Path and Metric=== | ||
+ | {| | ||
+ | |[[Image:ScreenShot716.jpg|800px|left|thumb|Hop Count vs Bandwidth]] | ||
+ | |} | ||
+ | ===Equal Cost Load Balancing=== | ||
+ | {| | ||
+ | |[[Image:ScreenShot717.jpg|800px|left|thumb|Equal Cost Load Balancing]] | ||
+ | EIGRP - Unequal Cost Paths | ||
+ | |} | ||
+ | ===Switching Function=== | ||
+ | {| | ||
+ | |[[Image:ScreenShot719.jpg|800px|left|thumb|A Day in the Life of a Packet]] | ||
+ | |} | ||
+ | ==Summary== | ||
+ | {| | ||
+ | |[[Image:ScreenShot720.jpg|800px|left|thumb|Summary]] | ||
+ | |} |
Latest revision as of 17:08, 21 October 2010
Contents
Introduction to Routing and Packet Forwarding
Inside the Router
Routers are Computers
Router CPU and Memory
Internetwork Operating System
Der findes forskellige IOS'er der har forskellige freatures.
Router Boot-up Process
Router interfaces
PPP, Frame Relay, and HDLC (High-Level Data Link Control) |
Routers and the Network Layer
CLI Configuration and Addressing
Basic Router Configuration
Building the Routing Table
Introducing the Routing Table
Vis en Route Print på windåse... |
Static Routing
Use Static routes when:
|
Dynamic Routing
Jobs of Dynamic Routing Protocols
|
Path Determination and Switching Functions
Packet Fields and Frame Fields
|
Best Path and Metric
Equal Cost Load Balancing
EIGRP - Unequal Cost Paths |