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Lab line connection diagram:  Lab content:Test Machine configuration [display]DCRS-5526S ConfigurationSwitchA (Config) # vlan 10SwitchA (Config-Vlan10) # switchport interface ethernet 0/0/1-8Set the port Ethernet0/0/0/1 access vlan 10

1. Point-to-point communicationPoint-to-point is a physical topology, such as optical fiber, which must be a point-to-point connection and a ddnleased line. That is, no machine exists in the middle of each machine at both ends. Point-to-point is at

1. Turn off the automatic summary function of all the above routers,2. Some loopback ports are added to R2 to run the OSPF protocol. The router information obtained by R1 is 3. On R24. view the learned route entries on the R1 and R3 routes.  

Use R3 to set the ip default-network 5.0.0.0 as the default gateway for R1 and R2 to access the Internet 111.111.111.111.View the Management Distance and latency of the v5.0.0.0 routes by using show ip VPN to all, compare the AD/FD, calculate the va

Headquarters RouterEnConf tIp router 0.0.0.0 0.0.0.0 200.0.0.2Crypto isakmp policy 1Encryption 3desHash shaAuthentication pre-shareGroup 2Lifectime 10000ExitCrypto isakmp key benet address 201.0.0.2Access-list 100 permit ip 192.168.1.0 0.0.255 192.16

STP spanning tree protocol is used to prevent layer-2 loop protocols.There are several terms in the Spanning Tree: root bridge root port specifies port root path overhead optional PortSeveral statuses of ports in the build treeDisable not

R1----------SW------------R2Condition: R1: 192.168.1.1 mac: a R2: 192.168.1.2 mac: BSw is a layer-2 Switch When R1 packets are forwarded to R2:When R1 receives the data packet, it queries the route table of R1. The purpose of querying the route

NAT configuration points: 1. ACL 2. NAT address pool 3. Apply NAT to the corresponding interface 4. one-to-many or one-to-one ing !Ip access-list standard 210 permit any!!!Interface GigabitEthernet 0/1Ip nat insideIp address 8.1.1.2

  Most network devices now support snmp, which can be used for better O & M, such as cisco switches and routers. The specific configuration methods are shared below.   1. Configure the SNMP proxy for the Cisco device: # Snmp-server community public

1,HSRP does not support setting real interface addresses to virtual gateway addresses, while VRRP supports2. HSRP carries packets on UDP packets, while VRRP carries packets on TCP packets. 3. HSRP has three types of packets, and three statuses can

  All routers connected to the same OSPF region will learn the same topology data. Each vro stores data in the link status database consisting of The Link Status announcement (LSA. Then, the router runs the SPF (Shortest Path First) algorithm on

1.1 HTTP protocol analysis tool-HttpWatch and HttpFoxMost of the actually deployed Server Load balancer applications perform Server Load balancer on Web applications, and the core of Web applications is HTTP. Therefore, we need a powerful tool that

In TCP/IP, TCP provides reliable connection services and uses three handshakes to establish a connection, as shown in figure 1.(1) first handshake: when A connection is established, client A sends the SYN Packet (SYN = j) to server B and enters the

  The MAC address in the IPv4 environment has become a common topic. Here is a summary and sharing.   In the TCP/IP architecture, MAC addresses play a very important role. In communication, the host Nic identified by the MAC address serves as the

  Summary of 802.3 frames of forward code Let's first look at a frame structure. We can easily understand and even capture packets from the data link layer, but the front guide code is not so easy to see its real structure. The authorization

IP address and subnet mask We all know that IP addresses are composed of four digits. Here, let's take a look at three common types of IP addresses. Class a ip segments 0.0.0.0 to 127.255.255.255 Class B IP segments 128.0.0.0 to

Bridge: The predecessor of A vswitch, which refers to vswitch 1: STP OverviewSTP (Spanning Tree Protocol, Spanning Tree Protocol)Is to change a ring structure into a tree structure. It is used to logically block a network with loops and generate a

1 fault symptomMy colleagues in the Department had remote access through the network in the office. They had been normal before and suddenly could not be remotely accessed yesterday.2 positioning processThey once assigned a fixed IP address to the

1. Brief Introduction to UDPUDP is a transport layer protocol, which is in a layer with TCP protocol. However, unlike TCP, UDP does not provide timeout retransmission, error retransmission, and other functions, that is, it is an unreliable protocol. 

Timeout retransmission is another important mechanism for TCP to ensure data reliability. Its principle is to enable a timer after a certain data is sent, if the ACK packet of the sent datagram is not received within a certain period of time, the