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CCNA RS_NB - Chapter 10
1.
Chapter 10: Ethernet
Network Basics © 2008 Cisco Systems, Inc. All Presentation_ID rights reserved. Cisco Confidential 1
2.
Chapter 10 -
Objectives Upon completion of this chapter you will be able to: Describe the operation of the Ethernet sublayers. Identify the major fields of the Ethernet frame. Describe the purpose and characteristics of the Ethernet MAC address. Compare the roles of the MAC address and the IP address. Describe the purpose of ARP. Explain how ARP requests impact network and host performance. Explain basic switching concepts. Compare fixed configuration and modular switches. Configure a Layer 3 switch. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2
3.
Chapter 10 10.0
Introduction 10.1 Ethernet Protocol 10.2 Address Resolution Protocol 10.3 LAN Switches 10.4 Summary Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 3
4.
10.1 Ethernet Protocol
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 4
5.
Ethernet Operation LLC
and MAC Sublayers Ethernet – One of the most widely used LAN technologies Operates in the data link layer and the physical layer Family of networking technologies that are defined in the IEEE 802.2 and 802.3 standards Supports data bandwidths of 10, 100, 1000, 10,000, 40,000, and 100,000 Mbps (100 Gbps) Ethernet standards – Define Layer 2 protocols and Layer 1 technologies Two separate sub layers of the data link layer to operate - Logical link control (LLC) and the MAC sublayers Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 5
6.
Ethernet Operation LLC
and MAC Sublayers Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 6
7.
Ethernet Operation LLC
and MAC Sublayers Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 7
8.
Ethernet Operation LLC
and MAC Sublayers LLC Handles communication between upper and lower layers Takes the network protocol data and adds control information to help deliver the packet to the destination MAC Constitutes the lower sublayer of the data link layer Implemented by hardware, typically in the computer NIC Two primary responsibilities: • Data encapsulation • Media access control Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 8
9.
Ethernet Operation MAC
Sublayer Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 9
10.
Ethernet Operation MAC
Sublayer Data encapsulation Frame assembly before transmission and frame disassembly upon reception of a frame MAC layer adds a header and trailer to the network layer PDU Provides three primary functions: Frame delimiting – identifies a group of bits that make up a frame, synchronization between the transmitting and receiving nodes Addressing – each Ethernet header added in the frame contains the physical address (MAC address) that enables a frame to be delivered to a destination node Error detection - each Ethernet frame contains a trailer with a cyclic redundancy check (CRC) of the frame contents Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 10
11.
Ethernet Operation MAC
Sublayer Media Access Control Responsible for the placement of frames on the media and the removal of frames from the media Communicates directly with the physical layer If multiple devices on a single medium attempt to forward data simultaneously, the data will collide resulting in corrupted, unusable data Ethernet provides a method for controlling how the nodes share access through the use a Carrier Sense Multiple Access (CSMA) technology Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 11
12.
Ethernet Operation Media
Access Control Carrier Sense Multiple Access (CSMA) process Used to first detect if the media is carrying a signal If no carrier signal is detected, the device transmits its data If two devices transmit at the same time - data collision Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 12
13.
Ethernet Operation Media
Access Control Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 13
14.
Ethernet Operation Media
Access Control The two commonly used methods are: CSMA/Collision Detection The device monitors the media for the presence of a data signal If a data signal is absent, indicating that the media is free, the device transmits the data If signals are then detected that show another device was transmitting at the same time, all devices stop sending and try again later While Ethernet networks are designed with CSMA/CD technology, with today’s intermediate devices, collisions do not occur and the processes utilized by CSMA/CD are really unnecessary Wireless connections in a LAN environment still have to take collisions into account Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 14
15.
Ethernet Operation Media
Access Control The two commonly used methods are: CSMA/Collision Avoidance (CSMA/CA) media access method Device examines the media for the presence of data signal-if the media is free, the device sends a notification across the media of its intent to use it The device then sends the data. Used by 802.11 wireless networking technologies Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 15
16.
Ethernet Operation Media
Access Control Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 16
17.
Ethernet Operation MAC
Address: Ethernet Identity Layer 2 Ethernet MAC address is a 48-bit binary value expressed as 12 hexadecimal digits IEEE requires a vendor to follow two simple rules: • Must use that vendor's assigned OUI as the first 3 bytes • All MAC addresses with the same OUI must be assigned a unique value in the last 3 bytes Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 17
18.
Ethernet Operation Frame
Processing MAC addresses assigned to workstations, servers, printers, switches, and routers Example MACs: 00-05-9A-3C-78-00, 00:05:9A:3C:78:00, or 0005.9A3C.7800. Forwarded message to an Ethernet network, attaches header information to the packet, contains the source and destination MAC address Each NIC views information to see if the destination MAC address in the frame matches the device’s physical MAC address stored in RAM No match, the device discards the frame Matches the destination MAC of the frame, the NIC passes the frame up the OSI layers, where the decapsulation process takes place Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 18
19.
Ethernet Frame Attributes
Ethernet Encapsulation Early versions of Ethernet were relatively slow at 10 Mbps Now operate at 10 Gigabits per second and faster Ethernet frame structure adds headers and trailers around the Layer 3 PDU to encapsulate the message being sent Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 19
20.
Ethernet Frame Attributes
Ethernet Frame Size Ethernet II and IEEE 802.3 standards define the minimum frame size as 64 bytes and the maximum as 1518 bytes Less than 64 bytes in length is considered a "collision fragment" or "runt frame” If size of a transmitted frame is less than the minimum or greater than the maximum, the receiving device drops the frame At the physical layer, different versions of Ethernet vary in their method for detecting and placing data on the media Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 20
21.
Ethernet Frame Attributes
Ethernet Frame Size The figure displays the fields contained in the 802.1Q VLAN tag Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 21
22.
Ethernet Frame Attributes
Introduction to the Ethernet Frame Preamble and Start Frame Delimiter Fields Used for synchronization between the sending and receiving devices Length/Type Field Defines the exact length of the frame's data field/ describes which protocol is implemented Data and Pad Fields Contain the encapsulated data from a higher layer, an IPv4 packet Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 22
23.
Ethernet Frame Attributes
Introduction to the Ethernet Frame Frame Check Sequence Field Used to detect errors in a frame with cyclic redundancy check, if calculations match at source and receiver, no error occurred. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 23
24.
Ethernet MAC MAC
Addresses and Hexadecimal Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 24
25.
Ethernet MAC MAC
Address Representations Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 25
26.
Ethernet MAC Unicast
MAC Address Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 26
27.
Ethernet MAC Broadcast
MAC Address Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 27
28.
Ethernet MAC Multicast
MAC Address Multicast MAC address is a special value that begins with 01-00-5E in hexadecimal Range of IPV4 multicast addresses is 224.0.0.0 to 239.255.255.255 Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 28
29.
MAC and IP
MAC and IP MAC address This address does not change Similar to the name of a person Known as physical address because physically assigned to the host NIC IP address Similar to the address of a person Based on where the host is actually located Known as a logical address because assigned logically Assigned to each host by a network administrator Both the physical MAC and logical IP addresses are required for a computer to communicate just like both the name and address of a person are required to send a letter Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 29
30.
Ethernet MAC End-to-End
Connectivity, MAC, and IP Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 30
31.
Ethernet MAC End-to-End
Connectivity, MAC, and IP Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 31
32.
10.2 Address Resolution
Protocol Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 32
33.
ARP Introduction to
ARP ARP Purpose – Sending node needs a way to find the MAC address of the destination for a given Ethernet link ARP protocol provides two basic functions: Resolving IPv4 addresses to MAC addresses Maintaining a table of mappings Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 33
34.
ARP ARP Functions/Operation
ARP Table – Used to find the data link layer address that is mapped to the destination IPv4 address As a node receives frames from the media, it records the source IP and MAC address as a mapping in the ARP table ARP request – Layer 2 broadcast to all devices on the Ethernet LAN The node that matches the IP address in the broadcast will reply If no device responds to the ARP request, the packet is dropped because a frame cannot be created Static map entries can be entered in an ARP table, but this is rarely done Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 34
35.
ARP ARP Functions/Operation
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 35
36.
ARP ARP Functions/Operation
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 36
37.
ARP ARP Functions/Operation
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 37
38.
ARP ARP Functions/Operation
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 38
39.
ARP ARP Functions/Operation
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 39
40.
ARP ARP Role
in Remote Communication If the destination IPv4 host is on the local network, the frame will use the MAC address of this device as the destination MAC address If the destination IPv4 host is not on the local network, the source uses the ARP process to determine a MAC address for the router interface serving as the gateway In the event that the gateway entry is not in the table, an ARP request is used to retrieve the MAC address associated with the IP address of the router interface Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 40
41.
ARP Removing Entries
from an ARP Table ARP cache timer removes ARP entries that have not been used for a specified period of time Commands may also be used to manually remove all or some of the entries in the ARP table Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 41
42.
ARP ARP Tables
on Networking Devices Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 42
43.
ARP Issues How
ARP Can Create Problems Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 43
44.
ARP Issues Mitigating
ARP Problems Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 44
45.
10.3 LAN Switches
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 45
46.
Switching Switch Port
Fundamentals Layer 2 LAN switch Connects end devices to a central intermediate device on most Ethernet networks Performs switching and filtering based only on the MAC address Builds a MAC address table that it uses to make forwarding decisions Depends on routers to pass data between IP subnetworks Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 46
47.
Switching Switch MAC
Address Table 1. The switch receives a broadcast frame from PC 1 on Port 1. 2. The switch enters the source MAC address and the switch port that received the frame into the address table. 3. Because the destination address is a broadcast, the switch floods the frame to all ports, except the port on which it received the frame. 4. The destination device replies to the broadcast with a unicast frame addressed to PC 1. Continued… Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 47
48.
Switching Switch MAC
Address Table 5. The switch enters the source MAC address of PC 2 and the port number of the switch port that received the frame into the address table. The destination address of the frame and its associated port is found in the MAC address table. 6. The switch can now forward frames between source and destination devices without flooding, because it has entries in the address table that identify the associated ports. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 48
49.
Switching Duplex Settings
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 49
50.
Switching Auto-MDIX Presentation_ID
© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 50
51.
Switching Frame Forwarding
Methods on Cisco Switches Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 51
52.
Switching Cut-through Switching
Two variants: Fast-forward switching: • Lowest level of latency immediately forwards a packet after reading the destination address, typical cut-through method of switching Fragment-free switching: • Switch stores the first 64 bytes of the frame before forwarding, most network errors and collisions occur during the first 64 bytes Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 52
53.
Switching Memory Buffering
on Switches Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 53
54.
Fixed or Modular
Fixed verses Modular Configuration Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 54
55.
Fixed or Modular
Fixed verses Modular Configuration Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 55
56.
Fixed or Modular
Fixed Configuration Cisco Switches Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 56
57.
Fixed or Modular
Modular Configuration Cisco Switches Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 57
58.
Fixed or Modular
Module Options for Cisco Switch Slots Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 58
59.
Layer 3 Switching
Layer 2 verses Layer 3 Switching Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 59
60.
Layer 3 Switching
Cisco Express Forwarding Two main components: Forwarding information base (FIB) • Conceptually similar to a routing table • A networking device uses this lookup table to make destination-based switching decisions during Cisco Express Forwarding operation • Updated when changes occur in the network and contains all routes known at the time Adjacency tables • Maintain layer 2 next-hop addresses for all FIB entries Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 60
61.
Layer 3 Switching
Cisco Express Forwarding Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 61
62.
Layer 3 Switching
Types of Layer 3 Interfaces The major types of Layer 3 interfaces are: Switch Virtual Interface (SVI) – Logical interface on a switch associated with a virtual local area network (VLAN). Routed Port – Physical port on a Layer 3 switch configured to act as a router port. Configure routed ports by putting the interface into Layer 3 mode with the no switchport interface configuration command. Layer 3 EtherChannel – Logical interface on a Cisco device associated with a bundle of routed ports. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 62
63.
Layer 3 Switching
Configuring a Routed Port on a Layer 3 Switch Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 63
64.
Ethernet Summary
Ethernet is the most widely used LAN technology used today. Ethernet standards define both the Layer 2 protocols and the Layer 1 technologies. The Ethernet frame structure adds headers and trailers around the Layer 3 PDU to encapsulate the message being sent. As an implementation of the IEEE 802.2/3 standards, the Ethernet frame provides MAC addressing and error checking. Replacing hubs with switches in the local network has reduced the probability of frame collisions in half-duplex links. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 64
65.
Ethernet Summary
The Layer 2 addressing provided by Ethernet supports unicast, multicast, and broadcast communications. Ethernet uses the Address Resolution Protocol to determine the MAC addresses of destinations and map them against known Network layer addresses. Each node on an IP network has both a MAC address and an IP address. The ARP protocol resolves IPv4 addresses to MAC addresses and maintains a table of mappings. A Layer 2 switch builds a MAC address table that it uses to make forwarding decisions. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 65
66.
Ethernet Summary
Layer 3 switches are also capable of performing Layer 3 routing functions, reducing the need for dedicated routers on a LAN. Layer 3 switches have specialized switching hardware so they can typically route data as quickly as they can switch. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 66
67.
Presentation_ID © 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential 67