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Ethernet Basics Ethernet Basics 2016-09-24 Ethernet Basics based on Chapter 4 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers Ethernet Basics • History • Ethernet Frames • CSMA/CD • Obsolete versions • 10Mbps versions • Segments • Spanning Tree Protocol 1 2016-09-24 Ethernet – Early History • 1970: ALOHAnet, first wireless packet-switched network - Norman Abramson, Univ. of Hawaii - Basis for Ethernet’s CSMA/CD protocol - 1972: first external network connected to ARPANET • 1973: Ethernet prototype developed at Xerox PARC - (Palo Alto Research Center) - 2.94 Mbps initially • 1976: "Ethernet: Distributed Packet Switching for Local Computer Networks" published in Communications of the ACM. - Bob Metcalfe and David Boggs - sometimes considered “the beginning of Ethernet” Ethernet goes Mainstream • 1979: DEC, Intel, Xerox collaborate on a commercial Ethernet specification - Ethernet II, a.k.a. “DIX” Ethernet - (Digital Equipment Corporation) • 1983: IEEE 802.3 specification formally approved - Differs from Ethernet II in the interpretation of the third header field • 1987: alternatives to coaxial cables - IEEE 802.3d: FOIRL, Fiber Optic Inter-Repeater Link - IEEE 802.3e: 1 Mbps over Twisted Pair wires (whoopee!) • 1990: Twisted-Pair wiring takes over - IEEE 802.3i: 10 Mbps over Twisted-Pair – 10Base-TX, 10Base-T4 2 2016-09-24 the Future is Now (next chapter) (and Now is so Yesteryear…) 1995 – Now: speed and cabling improvements • 1995: 100Mbps varieties • 1999: 1Gbps on twisted-pair • 2003-2006: 10Gbps on optical fiber and UTP • 2010: 40Gbps, 100Gbps (802.3ba) - optical fiber or twinaxial cable - point-to-point physical topology; for backbones • 2016, September: 2.5GBase-T, 5GBase-T ? - who knows? What Is Ethernet? • Protocols, standards for Local Area Networks » Ethernet II, IEEE 802.3 • Specifies Physical-layer components - Cabling, signaling properties, etc. - Numerous variations • Specifies Datalink-layer protocols - Media Access Control (MAC) – lower Datalink sublayer, interfaces to the Physical layer » IEEE 802.3 - Logical Link Control (LLC) – upper Datalink sublayer, common interface to the Network layer » IEEE 802.2 3 2016-09-24 Ethernet (802.3) relation to OSI 802.2 802.3 - The Early Variations 4 2016-09-24 Ethernet and Cabling – the Coaxial Era • 10Base5 (standard IEEE 802.3, 1983) • 10Base2 (standard IEEE 802.3a, 1985) • Physical bus topology required a logical bus topology • CSMA/CD protocol used in the Collision Domain 10Base5 • 1983: IEEE 802.3 - The original form • “Thick coax” cable - RG-8/U or RG-11 specified - half-inch diameter • “Vampire tap” connection punctures insulation to make electrical connections • “10Base5”: - 10 Mbps - Baseband signaling - 500 meters maximum length 5 2016-09-24 10Base2 • 1985: IEEE 802.3a - Physical update for cheaper cabling • “Thin coax” cable - RG-58a/u - 5mm diameter - electrically compatible with thick coax • BNC connectors allow easy disconnection, reconnection • “10Base2”: - 10 Mbps - Baseband signaling - 200 meters maximum length (actually 185m) Out of the Coaxial Era - Twisted Pair takes over • 10Base-T (IEEE 802.3i, 1990) - Twisted-Pair cables » Cheaper, easier to use than coax - 100m maximum length • 100Base-T (IEEE 802.3u, 1995) - “Fast Ethernet” - 100Base-T4: Cat3, 4 pairs used - 100Base-TX: Cat5, 2 pairs used • Full Duplex (IEEE 802.3x, 1997) - Applies to 100BaseT and later • Physical star, but Ethernet is still a bus-oriented protocol 6 2016-09-24 Ethernet on Optical Fiber • Alternate, longer-distance media extend Ethernet's reach • 10Base-FL (IEEE 802.3j, 1993) - 10Mbps, multimode optical fiber - 2000m maximum length - Not common • 100Base-FX (IEEE 802.3u, 1995) - “Fast Ethernet” - 100Base-FX: multimode optical fiber • Point-to-point physical topology Specialized Media • Twinax - heavily shielded cable - used for short, high- speed applications • Backplane - intra-chassis connections - high speed – 40 Gbps 7 2016-09-24 Common to All Variations Frame format, Behavior the Ethernet frame format Preamble: Dest. Src. MAC Type / Payload Padding? FCS IFG: 10101010 MAC length 96 bit- .. 46..0 0..1500 4 times 10101011 6 octets 6 octets 2 octets octets octets octets • Ethernet II header contains: • Physical frame starts with an - 6 octets: destination MAC address 8-octet preamble consisting of - 6 octets: source MAC address 1010…10101011 - 2 octets: payload-type field - 10Mbs versions only • 802.3 differs in the third field: • Maximum frame length is 1518 - payload length instead of type octets • 0-1500 octets: Payload, - including the FCS supplied by a higher protocol layer - excluding the preamble - Could be 802.2 - could be layer 3 • Minimum length is 64 octets - 46-0 octets: Padding w/ 0-bytes to insure - assures collision detection minimum frame length • Physical frame is followed by an IFG, • 4 octets: Ethernet footer contains InterFrame Gap FCS (Frame Check Sequence) - no signal transitions - a CRC checksum - 96 bit-times in duration 8 2016-09-24 Ethernet Addresses • Also called MAC addresses, • Written as 6 pairs of hardware or physical hexadecimal digits addresses, or Layer 2 - separated by colon or dash addresses • Examples: • 6 octets long - 00:1a:6b:4e:3f:1b - an “octet” refers to a » Linux “byte” and is used in - 40-A8-F0-A2-DD-CE networking » Windows • First three octets refer to the manufacturer or • Broadcast address: vendor ff:ff:ff:ff:ff:ff - As a destination, this • Last three octets must be means “send to all unique within a mfr/vendor available nodes” wireshark activity • start wireshark • Display filter eth.type - Any types other than 0x0800? - What layer-3 protocol(s)? • Display filter: eth.len - Observe layer-2 protocol(s) - What payload(s)? • Display filter: eth.addr==<your MAC address> - What traffic is coming from, going to your machine? 9 2016-09-24 Ethernet II versus 802.3 with 802.2 Ethernet II 802.3 type > 1500 length < 1500 • left: an Ethernet II frame specifies a type, and leaves the next layer to find the data’s end - all types are values greater than 1500 (0x0600) » viz., IP is type 0x0800 • right: an 802.3 frame specifies the payload length, and includes 802.2 headers - length is always 1500 or less Ethernet II frame 2016- 09-24 10 2016-09-24 802.3 frame, with 802.2 headers • This frame shows 802.3 and 802.2 headers. • This also shows the FCS (checksum) field, which Wireshark thinks is incorrect. 2016- 09-24 So, how does the NIC determine where a frame ends? • Ethernet II frame doesn’t specify its overall length • 10Base5, 10Base2 standards: - NIC detects end of signal - absence of current • 10Base-T: - NIC listens for a special TP_IDL signal on the wire, followed by InterFrame Gap • 100Base-T, GigE, 10GigE: - 4B/5B encoded “start-of-frame signals” and “end-of- frame signals” replace preamble and TP_IDL 11 2016-09-24 10BaseT: The FCS and TP_IDL signal CSMA / CD • Carrier-Sense Multiple Access with Collision Detection • Multiple Access: more than one node can transmit on the shared medium • Carrier-Sense: a NIC that wants to transmit must first listen for an active transmission - if it doesn’t hear an idle “carrier signal” it backs off and waits before trying again • Collision Detection: if a NIC hears interference while it is transmitting, it knows that a collision with another transmission has occurred • Colliding nodes attempt to re-transmit using an “Exponential Backoff” approach 12 2016-09-24 Collisions and Exponential Backoff • When a NIC detects a collision, it: - transmits at least 64 bytes, then stops - waits a fixed amount of time - repeats the CSMA/CD attempt • If a second collision occurs, it waits twice as long • If a third collision, wait twice as long again • This gives exponentially-increasing wait times - After 10 collisions the wait remains constant - After 16 collisions, the attempt is abandoned What Exponential Backoff looks like • X-axis: number of collisions • Y-axis: relative waiting time 13 2016-09-24 Segments and Collision Domains • All the nodes sharing a cable form a segment • The segment defines a collision domain - Frames on a segment can collide with each other… These two segments form separate collision domains Extended Collision Domains • A repeater, such as this one, connects two segments into a single collision domain - Frames on either segment can collide with others. • Hubs (a.k.a. multi-port repeaters) do the same thing, with multiple segments • Switches don't – they keep collision domains separate 14 2016-09-24 (other definitions of “segment”) • "Segment" may have other meanings… • Related meanings in Ethernet: - "Segment" and "Collision Domain" are sometimes used interchangeably. - A "Segment" can refer to a "Broadcast Domain". • Unrelated meanings in the TCP/IP world: - "Segment" refers to a "protocol data unit" at the Transport layer of the OSI or TCP/IP stack. » versus "frame" which refers to a protocol data unit at the Datalink and Physical layers – viz., Ethernet frame - "Segment" can mean an IP subnetwork. Hubs and Extended Collision Domains • A repeater (or hub) joins two (or more) segments • These segments share a common collision domain - The hub will broadcast all frames, as if the two segments were one 15 2016-09-24 The (Obsolete) 5-4-3 Rule • The “5-4-3” rule (or “5-4-3-2-1” rule) - ≤ 5 segments (cables) - connected by ≤ 4 repeaters - ≤ 3 active segments (i.e., with transmitting nodes) - 2 passive segments • Single Collision Domain • (Not important in switched networks…) 2016- 09-24 how big can a collision domain be? • 5-4-3 rule limits amount of cable in use • How far apart could two computers be, using 10Base5
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