CẤU TRÚC MẠNG LAN (PHÂN 2)

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Mục tiêu • Tóm tắt hoạt động của Ethernet như được định nghĩa cho 100/1000 Mbps LAN trong tiêu chuẩn IEEE 802,3. • Giải thích các chức năng cho phép một chuyển đổi để chuyển tiếp Ethernet khung trong mạng LAN. • Cấu hình chuyển đổi hoạt động trong một mạng thiết kế để hỗ trợ thoại, video và dữ liệu truyền.

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Nội dung Text: CẤU TRÚC MẠNG LAN (PHÂN 2)

CCNA – Semester 3 Chapter 2: Basic Switch Concepts and Configuration CCNA Exploration 4.0
Objectives • Summarize the operation of Ethernet as defined for 100/1000 Mbps LANs in the IEEE 802.3 standard. • Explain the functions that enable a switch to forward Ethernet frames in a LAN. • Configure a switch for operation in a network designed to support voice, video, and data transmissions. • Configure basic security on a switch that will operate in a network designed to support voice, video, and data transmissions. 2
Introduction to Ethernet/802.3 LANs 3
Media Access Control in Ethernet 44
CSMA/CD 55
CSMA/CD 66
CSMA/CD 77
CSMA/CD 88
Ethernet Communications Ethernet Communications: – Unicast – Broadcast – Multicast 9
Ethernet Communications • Ethernet Frame: • Ethernet Address 10
Duplex Settings 11
Switch Port Settings • The Cisco Catalyst switches have three settings: – The auto option sets autonegotiation of duplex mode. With autonegotiation enabled, the two ports communicate to decide the best mode of operation. – The full option sets full-duplex mode. – The half option sets half-duplex mode. • Auto-MDIX • The auto-MDIX feature is enabled by default on switches running Cisco IOS Release 12.2(18)SE or later. For releases between Cisco IOS Release 12.1(14)EA1 and 12.2(18)SE, the auto-MDIX feature is disabled by default. 12
MAC Addressing and Switch MAC Address Tables 13
MAC Addressing and Switch MAC Address Tables 14
MAC Addressing and Switch MAC Address Tables 15
MAC Addressing and Switch MAC Address Tables 16
MAC Addressing and Switch MAC Address Tables 17
MAC Addressing and Switch MAC Address Tables 18
Design Considerations for Ethernet/802.3 Networks • Bandwidth and Throughput – A major disadvantage of Ethernet 802.3 networks is collisions. • Collision domains: 19
Design Considerations for Ethernet/802.3 Networks Broadcast Domains: • Although switches filter most frames based on MAC addresses, they do not filter broadcast frames. For other switches on the LAN to get broadcasted frames, broadcast frames must be forwarded by switches. A collection of interconnected switches forms a single broadcast domain. Only a Layer 3 entity, such as a router, or a virtual LAN (VLAN), can stop a Layer 2 broadcast domain. Routers and VLANs are used to segment both collision and broadcast domains. The use of VLANs to segment broadcast domains will be discussed in the next chapter. 20