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Nslookup is a very interesting small command. We use it to see what information is available on DNS.[Root @ monitor ~] # Nslookup-q = any baidu.comServer: 8.8.8.8Address: 8.8.8.8 #53Non-authoritative answer:Baidu.comOrigin = dns.baidu.comMail addr =

IS-IS comparison with OSPF1) IS-IS only defines two network topology types: broadcast and general topology. In a Cisco router, links are divided into point-to-point and broadcast.OPSF defines five network types: point-to-point, point-to-multipoint,

Chapter 1 1. about layering: TCP/IP protocol is divided into four layers: link layer, network layer, transport layer, and application layer; the layer-2 switches, layer-3 switches, and layer-2 networks we usually call follow the OSI (Open System

The data link layer has three purposes: Sends and receives IP data packets for the IP module.Sends ARP requests to the ARP module and receives ARP responses.Send RARP requests for RARP and receive RARP responsesWe have heard of ip addresses. As for

Difference Between TCP persistent connection and short connection 1. TCP connection when the network communication adopts the TCP protocol, a connection must be established between the server and the client before the real read/write operations.

Parsing XMPP protocol analysis and application XMPP is an XML-based protocol that inherits the flexible development in the XML environment. Therefore, XMPP-based applications are highly scalable. After the extension, XMPP can send extended

The difference between http and https indicates that SSL encryption is used before a URL and https: // prefix. It is safer to transmit and receive information between your computer and the server. To enable SSL for a Web server, you need to obtain a

A Brief Analysis of DHCP Client's dynamic acquisition of IP addresses from the DHCP server, mainly through four stages: www.2cto.com (1) discovery stage, that is, the DHCP client looking for a DHCP server stage. The client sends a DHCP-DISCOVER

TCP three-way handshake/four-way handshake explanation 1 establish a connection protocol (three-way handshake) (1) the client sends a TCP packet with SYN flag to the server. This is packet 1 during the three-way handshake. (2) The server responds to

HTTP Header details HTTP (HyperTextTransferProtocol) is Hypertext Transfer Protocol. Currently, the General Protocol for webpage transmission. The HTTP protocol uses the request/response model. The browser or other clients send requests and the

Network Layer IP protocol of TCP/IP series when data is directly transmitted over the Internet, the router routes data according to the IP address datagram. when a host needs to send data, the target host is generally a host in the LAN or a host

The relationship between the network level protocol and the structure system between the LAN and the Internet communication is completed with the support of different network levels and network level protocols. So what are their definitions and

The six main LSA types of OSPF are: the first type. router LSA. router lsa describes the link or interface connected to the physical interface of the ROUTER, and specifies the status and cost of the link. the router in each OSPF area generates the

The LAN is divided into two different CIDR blocks: Router 1 Address: 192.168.1.1 router 2 address: 192.168.2.1Step 1:First, we pull a network cable from any vswitch in the LAN (CIDR Block 1) to the WAN Interface of our 2nd routers, connect a network

One day in a certain month, I wrote half a blog article on the WLW without CTRL + S to study "TCP/IP details volume 1"-link layer, suddenly, my roommate made a trip to the electric cooker with a great deal of cooking power, and there was a power

Iptables and iproute2 are used to achieve network load balancing. Assume that there are two external interfaces in the Network: eth0 172.16.1.1/24, eth1 10.0.0.1/24, and the interface connecting to the internal network is eth2 192.168.1.1. Now we

The neighbor state machine after the mtu value of the H3C OSPF interface has been studying the OSPF principle and configuration of H3C over the past few days. Now there are two routers R3 and R4 connected through their respective Ethernet ports E0/0,

The correspondence between the OSI model and the TCP/IP protocol the layers of popular TCP/IP protocols are not divided by the OSI reference model, but have a general correspondence with them. Network layer protocols mainly include the IP protocol

DNS Literacy Series 8: Authorization for domain name resolution involves two concepts: domain name authorization: specifying who is the authoritative DNS of the domain name, that is, who is responsible for resolving the domain name (completed by the

Analysis of TCP/IP protocol stack (1) 1. layer: TCP/IP is divided into four layers: link layer, network layer, transmission layer, and application layer. The most critical two layers are the network layer and transmission layer. The network layer