chap3 Device+Overview.pdf

Device Overview ? 2000, Cisco Systems, Inc. 2-1 Objectives On completion of this chapter, you will be able to perform the following tasks: ? Describe how data traffic is exchanged between source and destination devices ? Identify the roles and functions of a hub, it h d t d h th b t fit isw c , an rou er, an w ere ey es n the network ? Select the appropriate Cisco equipment for a given set of network requirements ? 2000, Cisco Systems, Inc. ICND v1.0a—2-2 Written Exercise: OSI Model OS PDU F ti l R ibiliti E l Application I Model unc ona espons es xamp es Presentation Session Transport Network Data Link ? 2000, Cisco Systems, Inc. ICND v1.0a—2-3 Physical Role of Data Flow Layers EXAMPLES TCP UDP SPX Transport ? Reliable or unreliable delivery ? Error correction before retransmit IP IPX Network Provide logical addressing which routers use for path determination 802.3 / 802.2 HDLC Data Link ? Combines bits into bytes and bytes into frames ? Access to media using MAC address EIA/TIA-232Ph i l ? Error detection not correction ? Move bits between devices S ifi lt i d d ? 2000, Cisco Systems, Inc. ICND v1.0a—2-4 V.35 ys ca ? pec es vo age, w re spee an pin-out cables Physical Layer Functions D fie nes ? Media type ? Connector type 0 2 . 3 i c a l ? Signaling type 8 0 P h y s ? 2000, Cisco Systems, Inc. ICND v1.0a—2-5 Physical Layer: Ethernet/802.3 10Base2—Thin Ethernet 10Base5—Thick Ethernet Host Hub 10BaseT—Twisted Pair Hosts ? 2000, Cisco Systems, Inc. ICND v1.0a—2-6 Hubs Operate at Physical layer Physical A B C D ? All devices in the same collision domain ? All devices in the same broadcast domain D i h th b d idth ? 2000, Cisco Systems, Inc. ICND v1.0a—2-7 ? ev ces s are e same an w Hubs: One Collision Domain M d t ti? ore en s a ons means more collisions ? CSMA/CD is used ? 2000, Cisco Systems, Inc. ICND v1.0a—2-8 Data Link layer Functions D fie nes ? Physical source and d ti ti ddes na on a resses