ccnaicnd40s02l(编辑修改稿)

ccnaicnd40s02l(编辑修改稿)内容摘要：

ICND—226 Physical Layer: Ether/ Hub Hosts Host 10Base2—Thick Ether 10Base5—Thick Ether 10BaseT—Twisted Pair ICND—227 A B C D Physical • All devices in the same collision domain • All devices in the same broadcast domain • Devices share the same bandwidth Hubs Operate at Physical layer ICND—228 Hubs: One Collision Domain • More end stations means more collisions • CSMA/CD is used ICND—229 Defines • Physical source and destination addresses • Higher layer protocol (Service Access Point) associated with frame • Network topology • Frame sequencing • Flow control • Connectionoriented or connectionless Data Link Physical EIA/TIA232 Data Link layer Functions ICND—230 Data Source add FCS Length Dest add Variable 2 6 6 4 Vendor assigned IEEE assigned MAC Layer Data Link Layer Functions (cont.) Preamble Ether II uses “Type” here and does not use . MAC Address 8 Bytes ICND—231 • Each segment has its own collision domain • All segments are in the same broadcast domain Data Link Switches and Bridges Operate at Data Link Layer OR 1 2 3 1 2 4 ICND—232 Switches • Each segment has its own collision domain • Broadcasts are forwarded to all segments Memory Switch ICND—233 • Defines logical source and destination addresses associated with a specific protocol • Defines paths through work • Interconnects multiple data links Network IP, IPX Data Link Physical EIA/TIA232 Network Layer Functions ICND—234 Data Source address Destination address IP Network Layer Functions (cont.) Header Node Network • Logical Address Netw。