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TCP packet header analysis captures network data today! I checked the TCP information! I think it may be useful to everyone. Let's put it here! The TCP Header SEQ is equal to the initial sequence number of the connection selected by the host and the

One complete HTTP Communication step the HTTP Communication Mechanism is in a complete HTTP Communication Process, the Web browser and the Web server will complete the following seven steps: 1. Before establishing a TCP connection www.2cto.com, the

The connection we often see when using online banking starts with "https". What is this https? This actually indicates that the current connection uses SSL encryption to ensure that the client-to-server communication is protected. What if the

How to Set and activate an IP address in Linux? We can use the command to set the IP address, but the premise of this method isThe condition is that the user requires the root permission. In linux/etc/sysconfig/network-script/ifcfg-eth0The file

Test VTP redundancy network I. simulation software uses Dynamips to simulate the network environment. 2. Connecting an external router, two core switches (1 and 2), one access switch, and two hosts (1 and 2) the F0/0 of the core switches 1 and 2

The network topology of a certain organization is detailed at the right side of the device on the fifth floor of the company. The two Cisco 3560 are the core, and Port-channel is used between them. On the two devices, vlan 3, vlan 10, vlan 816 and

A port image copies packets from a specified port (source port), VLAN (source VLAN), or CPU (source CPU) to another port (destination port ), the destination port is connected to the data monitoring device. You can use these data monitoring devices

Stop-and-wait is the simplest but most basic data link layer protocol. The send status variable V (S) is updated once and a new data frame is sent only after the ACKn frame with the correct serial number is received. When receiving a data frame, the

The cisco vlan relay protocol (VTP) VTP solves the problem of repeated VLAN creation on many switches. www.2cto.com VTP allows you to create VLANs on one switch and then use the mutual learning function between switches, spread the created vlan

The NAT and ipsec vpn (2) of the link balancing device have a description of the link Load Balancing NAT and IPSec VPN, including the IPSec VPN tunnel mode and the brutal mode. In addition, how can we establish a site-to-site tunnel in a

Configure Router> www.2cto.com Router> enRouter # conf tEnter configuration commands, one per line. end with CNTL/Z. router (config) # int e0Router (config-if) # ip add 172.16.1.1 route 255.255.0router (config-if) # no shut % LINK-3-UPDOWN:

ACL placement rules can be placed in the appropriate location to filter out unnecessary traffic, making the network more efficient. ACL can act as a firewall to filter data packets and remove unnecessary traffic. The location of the ACL determines

Object-group (ASA advanced ACL feature) four types of object-group: www.2cto.com 1. protocol2.Network3. service4.ICMP-protocol-group protocol tcp_udp_icmpprotocol-object tcpprotocol-object udpprotocol-object protocol-group network

Www.2cto.com! Next we will configure to block the PC in VLAN 4 from access to the PC in our VLAN2. Because it controls traffic, we will use the standard control list (list number 1-99 1300-1999) the standard ACL (Access Control List) is as close as

IPv4 and ipv6 address representation, space and Type 1, IPv6 address representation in text representation of IPv6 addresses in three standard forms: www.2cto.com 1) the preferred format is X: X, where X is the hexadecimal value of 8 16-bit address

In the TCP/IP protocol family, the underlying layer is composed of basic communication channels, such as Ethernet or modem dial-up connections. These channels are used by the network layer, and the network layer is used to transmit packets to their

The transport layer of TCP protocol and UDP protocol 1.TCP/ IP system includes two Protocols: TCP protocol and UDP protocol. Www.2cto.com (1) TCP protocol (Transmission Control Protocol) provides reliable end-to-end communication, which ensures that

Details about TCP and UDP in the transmission layer of the ground network1. Necessity of the transport layer because the packet transmission at the network layer is unreliable, the time when the data reaches the destination cannot be understood, and

Use dual-nic binding and multi-path to prevent SPOF (SPOF) for high-availability dual-nic binding temporarily: modprobe bonding miimon = 100 mode = 0 (listen every 100 milliseconds) (0 load balancing and fault tolerance, 1 fault tolerance) ifconfig

Network Technology and ideas talking about single-ended port aggregation and loop port aggregation and the purpose of load or provide redundant backup on the Ethernet link, it has a fundamental conflict with another solution, because it not only