fddi

architecture, network switches are divided into access layer switches, aggregation layer switches, and core layer switches. Among them, all the core layer switches adopt the modular chassis design, and have basically designed the 1000Base-T module. The ethernet switch that supports 1000Base-T in the access layer is basically a fixed-port switch. It uses 10/100 M Port as the main port and provides a 1000Base-T uplink port in a fixed port or expansion slot mode. The 1000Base-T switch of the aggre

----------------------------------------------------------------- 300 5 256 0 disabled Last Updater --------------- 0.0.0.0 Cat5001> (enable) -------------------------------------------------------------------------------- Add Catalyst 5002 to the domain You need to add Catalyst 5002 To The VTP management domain named cisco and set it to VTP client. It will receive VTP configurations and updates from the VTP server. Note: by default, the Catalyst 5000 series switches are VTP servers. Cat5002> (

ethernet switch that supports 1000Base-T in the access layer is basically a fixed-port switch. It uses 10/100 M Port as the main port and provides a 1000Base-T uplink port in a fixed port or expansion slot mode. The 1000Base-T switch of the aggregation layer has two types of designs: the Chassis type and the fixed port type. It can provide multiple 1000Base-T ports, and generally other ports such as 1000Base-X. The access layer and aggregation layer switches form a complete small and medium LAN

about each part of the packets. Information that can be returned by IPTraf includes: 　　 Total number of IP, TCP, UDP, ICMP packets, and non-IP bytes. 　　 The source/destination address of the TCP connection and the source/destination port. 　　 Number of TCP packets and number of nodes. 　　 TCP flag status. 　　 UDP source/destination information. 　　 ICMP type information. 　　 OSPF source/destination information. 　　 TCP and UDP Service value. 　　 Network Interface Message count. 　　 Network interface IP

contains not less than 2 "1";How did this rule come about? This is going to be explained in terms of the characteristics of MLT-3 yards. MLT -3 yards of the characteristics of the simple saying is: every "1" Jump change, every "0" does not jump change. In order to make the 4b/5b encoded in the code stream there are enough jumps in the code stream need to have as many as possible "1" and as little as possible "0".The feature of this encoding is to send the data stream every 4bit as a group, and

characteristics of the simple saying is: every "1" jump change, every "0" does not jump change. In order to make the 4b/5b encoded in the code stream there are enough jumps in the code stream need to have as many as possible "1" and as little as possible "0". The feature of this encoding is to send the data stream every 4bit as a group, and then follow the 4B/5B encoding rules to convert it to the corresponding 5bit code. There are 32 combinations of 5bit codes, but only 16 of them correspond t

needs to be performed on the source station, and the route needs to be calculated repeatedly when the network configuration changes. 7.3.3 transparent Source Path (1) The spanning tree bridge is also known as the transparent bridge. 7.3.4 conversion Bridge (1) The conversion bridge is required for conversion between different LAN 7.3.5 FDDI Bridge (1) Distributed Optical Fiber Interface data bridges connect many Ethernet networks and mark the ring ne

Group Management Protocol (IGMP), which is introduced in the next chapter.12.4.3 The process of ing the same D-class IP address to a 48-bit FDDI address in the multicast FDDI network of the fddi and the Lingling ring network [Katz 1990]. The wildcard ring network usually uses different address ing methods because of the restrictions in most Token control. Broadc

[20:2]=0x4854 0X4745 is the first two letters "GE" for "get" and 0x4854 is the first two letter "HT" of "HTTP". Tcpdump does not completely decode the intercepted data, and most of the content in the packet is printed directly in hexadecimal form. Obviously this is not conducive to the analysis of network failures, the usual solution is to use the tcpdump with the-w parameter to intercept the data and save to the file, and then use other programs (such as Wireshark) for decoding analysis. Of c

Ethernet cards on its chassis with two expansion slots. PIX520 is suitable for use in telecom industry and large enterprises, and can provide 256,000 simultaneous connections. Supports multiple media types: Ethernet, Token Ring, and FDDI. Up to 6 Ethernet interfaces, maximum support for 3 token ring interfaces and 2 FDDI network interfaces, and Ethernet interface cards can only be mixed with Token ring int

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. Generally, enterprise-level switches are rack-mounted and department-level switches can be rack-mounted or fixed-configuration switches, t

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. Generally, enterprise-level switches are rack-mounted, and department-level switches can have fewer rack-mounted slots) or fixed configurations, the working grou

switches, Gigabit Ethernet switches, FDDI switches, ATM switches, and wildcard ring switches, these switches are applicable to Ethernet, fast Ethernet, FDDI, ATM, and ring-based network. Enterprise-level switches, department-level switches, and working group switches are available for large-scale applications. The standards of various manufacturers are not completely consistent. Generally, enterprise-level

[Guide] The ATM physical layer generally includes the OSI physical layer and the data link layer. features such as the physical media of the OSI physical layer determine the child layer and the transmission collection (TC) child layer with the same functions as the data link. There are no special physical layer features for ATM. On the contrary, SONET, FDDI, and other transmission systems are used to transport ATM cells. Therefore, we will focus on th

to that multicast group , which differs from the UDP that a single process receives for unicast UDP datagrams. with multicasting, there may be multiple processes on one host that belong to the same multicast group . When multicast data needs to be forwarded across routers beyond a single physical network, a protocol is required to make the multicast router aware of any host that determines whether the network belongs to a certain multicast group, which is the IGMP protocol (Interne

1:fddi/cddi (Fiber/copper Distributed Data Interface) 2:ATM (Asynchronous transfer Mode) 3:fast ETHERNET (Fast Ethernet) below analyze these three kinds of technology: 1:fddi/cddi (Fiber/copper Distributed Data Interface) This is a mature, non-carrier listening, 100M bandwidth sharing network technology. The use of token delivery service strategy, network equipment between the main ring and vice-r

tcp[20:2]=0x4854 0X4745 is the first two letters "GE" for "get" and 0x4854 is the first two letter "HT" of "HTTP". Tcpdump does not completely decode the intercepted data, and most of the content in the packet is printed directly in hexadecimal form. Obviously this is not conducive to the analysis of network failures, the usual solution is to use the tcpdump with the-w parameter to intercept the data and save to the file, and then use other programs (such as Wireshark) for decoding analysis.

software PRODUCT, Websense. 110 Question: Which operating systems can the software on Netsonar apply to? Answer: Netsonar has the following software systems: ns-20-nt;ns-201-s-2500. The former is used in windowsnt environments, which are used in Solaris environments. 111 Question: What is the difference between the current Cisco PIX Firewall products? Answer: In the current PIX firewall series, there are two main models PIX515 and PIX520. The main differences are as follows: PIX515 suitable for

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. Generally, enterprise-level switche

switching. Some VLAN hubs also have simple routing functions and are suitable for establishing LAN or even backbone networks.6) configure and manage vrouters. The router is used to forward packets at the network layer. It effectively isolates broadcast storms and supports Protocol Transition. A router can be used for backbone connections or for wide-area connections between campus networks and regional network centers. When selecting a vro, pay attention to the network interfaces supported by t