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for SNMPv2RFC 1906 -- transport mappings for SNMPv2RFC 1907 -- MIB for SNMPv2 Proposed standards:RFC 2576 -- coexistence between SNMP versions Informational:RFC 2570 -- Introduction to SNMPv3 Experimental:RFC 2786 -- Diffie-Hellman USM Key Management Vi. agentx Protocol Proposed standards:RFC 2741 -- agentx Protocol Version 1RFC 2742 -- agentx MIB VII. smiv1 MIB Full standards:RFC 1213 -- Management Information Base IIRFC 1643 -- Ethernet-like Interface Types MIB Draft standards:RFC 1493 -- Bri

TCP/IP layer-4 model and OSI Layer-7 ModelTable 1-1 is the table corresponding to the TCP/IP layer-4 model and the OSI Layer-7 model. We map the OSI Layer-7 network model with the Linux TCP/IP layer-4 concept model, and then classify various network protocols.Table 1-1 TCP/IP layer-4 model and OSI Layer-7 Model OSI Layer-7 Network Model Linux TCP/IP layer-4 Conceptual Model Corresponding network protocol Application) Application Layer TFTP, FTP, NFS, WAIS P

out.Example: Tcpdump-n-i eth0 DST 192.168.31.147 or 192.168.31.157 and TCPKey words:About types of keywords: host,net,portKeywords to determine transmission direction: SRC,DST,DST or SRC,DST and SRCProtocol keyword: FDDI,IP,ARP,RARP,TCP,UDPFDDI indicates that it is in FDDI (Distributed Fiber Data Interface Network)Gateway, broadcast,less, greaterThree types of logic operationsTake non-operation is ' not '!

The most common encapsulation on the link layer is Ethernet and IEEE 802 encapsulation, where Ethernet is used as an object of instruction. I. Overview the data link layer belongs to the bottom of the computer network, and the channel used mainly has two kinds of point-to-point channel and broadcast channel.In the TCP/IP protocol family, the data link layer has three main purposes: 1 send and receive data for the IP Module 2, send ARP request and receive ARP reply 3 for the ARP module, send RAR

Switching technology is a simplified, low-cost, high-performance and high-end port-intensive exchange products, reflecting the bridging technology of the complex switching technology in the OSI Reference Model of the second layer of operation. Unlike the bridge, the switch forwarding delay is very small, the operation is close to the single LAN performance, far more than the normal bridge between the Internet forwarding performance. The switching technology allows the bandwidth adjustment of th

activeSet vlan 19 name Library type ethernet mtu 1500 said 100019 state activeSet vlan 20 name New_Shiyanzhongxin type ethernet mtu 1500 said 100020 state activeSet vlan 22 name Old_Shiyanzhongxin type ethernet mtu 1500 said 100022 state activeSet vlan 23 name CaiZhuan_Jiashuyuan type ethernet mtu 1500 said 100023 state activeSet vlan 1002 name fddi-default type fddi mtu 1500 said 101002 state activeSet vl

communication platforms. LAN switches are used in local networks to connect terminal devices, such as PCs and network printers. The transmission media and transmission speed can be divided into Ethernet switches, Fast Ethernet switches, Gigabit Ethernet switches, FDDI switches, ATM switches, and wildcard ring switches. Large-scale applications can be divided into enterprise-level switches, department-level switches, and working group switches. Genera

switch, and the inter-network routing work is handed over to the router. Basic vswitch knowledge: vswitch classification and selection metrics From the perspective of transmission media and transmission speed, LAN switches can be divided into Ethernet switches, Fast Ethernet switches, Gigabit Ethernet switches, FDDI switches, ATM switches, and wildcard ring switches, these switches are applicable to Ethernet, fast Ethernet,

Cisco LAN switches are still commonly used. So I studied the maintenance and configuration problems of Cisco LAN switches. I would like to share them with you here, hoping to help you. Cisco LAN switches have evolved from a HUB-based LAN shared in the traditional sense to a broader space. Take Cisco's ipvst5000 series Cisco LAN switch as an example. It includes an integrated switching hardware structure, 10-Mbps Ethernet that supports switching, and-Mbps Fast Ethernet, supports fast Ethernet,

the packet. In a broad sense, there are two types of switches: WAN switches and LAN switches. WAN switches are mainly used in the telecom field to provide basic communication platforms. LAN switches are used in local networks to connect terminal devices, such as PCs and network printers. The transmission media and transmission speed can be divided into Ethernet switches, Fast Ethernet switches, Gigabit Ethernet switches, FDDI switches, ATM switches,

meet the switching needs of the bandwidth network switch traffic and the upper-level trunk. Prevents trunk communication bottlenecks. Such as FDDI, ATM, and G bit optical module. Maximum number of VLANs This parameter reflects the maximum number of VLANs supported by a device. The maximum number of VLANs supported by a broadband network switch (over 1024) is sufficient to meet the needs of general enterprises. VLAN Division should follow the 802.1Q s

communication platforms. LAN switches are used in local networks to connect terminal devices, such as PCs and network printers. The transmission media and transmission speed can be divided into Ethernet switches, Fast Ethernet switches, Gigabit Ethernet switches, FDDI switches, ATM switches, and wildcard ring switches. Large-scale applications can be divided into enterprise-level switches, department-level switches, and working group switches. Genera

802.1q trunking, refer! -- Trunking Between Catalyst 4000,500 0, and6000 Family Switches Using 802.1q Encapsulation.Optional st6500> (enable) set trunk 3/1 nonegotiate dot1qPort (s) 3/1-2 trunk mode set to nonegotiate.Port (s) 3/1-2 trunk type set to dot1q.Extends st6500> (enable) show configThis command shows non-default invocations only.Use 'show config all' to show both default and non-default deployments..............................Begin!# ***** NON-DEFAULT CONFIGURATION *****!!# Time: Thu

C2950 is in VTP client mode, you cannot add or delete VLANs. Therefore, you must change the mode before configuring C2950. If it is changed to the server mode, once the revision number is higher than other switches, it is easy to overwrite the original VLAN. Therefore, only the transparent mode can be configured. You can add or delete VLANs without updating them.C2950 (config) # vtp mode transparentC2950 (config) # vlan 100C2950 (config-vlan) # exitView VLAN information:Sw-2 # show vlanVLAN Nam

meet the switch traffic switching requirements with the upper-level trunk. Prevents trunk communication bottlenecks. Common High-Speed ports include: FDDI: The application is earlier and has a wide range. However, there is a cost for protocol conversion.Fast Ethernet/Gigabit Ethernet: easy to connect, low protocol conversion costs, but limited by the network size. ATM: provides high-speed switching ports, but the protocol conversion costs are high.Ii

this network. Figure 2 In the 10Base-T network, all devices need to be connected to one or more hubs with unshielded twisted pair wires. The hub should have multiple ports or even multiple types of ports. Sometimes you need to connect multiple hubs. In this case, you may want to use a high-speed port to establish a network trunk. The hubs and servers should be directly connected to the high-speed trunk. Because most of the main LAN communication is between the workstati

$1 $ FMFQ $ HfZR5DUszVHIRhrz4h6V70set enablepass $1 $ FMFQ $ HfZR5DUszVHIRhrz4h6V70set prompt Console> set length 24 defaultset logout 20 set banner motd ^ C! # Systemset system baud 9600 set system modem disableset system name 5500 Cset system locationset system contact! # Ipset interface sc0 1 route 255.255.255.0 255.set interface sc0 upset interface sl0 0.0.0.0 255.interface sl0 upset arp agingtime 1200 set ip redirect enableset ip route enableset ip fragmentation enableset ip route 0.0.0.0

Ethernet switches, Fast Ethernet switches, Gigabit Ethernet switches, FDDI switches, ATM switches, and wildcard ring switches. Large-scale applications can be divided into enterprise-level switches, department-level switches, and working group switches. Generally, enterprise-level switches are rack-mounted, and department-level switches can have fewer rack-mounted slots) or fixed configurations, the working group-level switch is relatively simple wit

switches, Fast Ethernet switches, Gigabit Ethernet switches, FDDI switches, ATM switches, and wildcard ring switches. Large-scale applications can be divided into enterprise-level switches, department-level switches, and working group switches. Generally, enterprise-level switches are rack-mounted, and department-level switches can have fewer rack-mounted slots) or fixed configurations, the working group-level switch is relatively simple with fixed c

the AS know the routing information to the AS border router. The definition of an AS border router is independent from those of the preceding vrouters. An AS border router can be a vro within a region or a regional border router.Specify a Router-DR: in a broadcast, multi-access network such as Ethernet, TokenRing, and FDDI environment), a specified Router Designated Router exists ), the specified router completes the following work in the OSPF Protoc