What is SYN message in TCP?
A TCP request for initiating a connection:
- step 1: a connection request from a client to a server (the client sends a TCP packet with the SYN flag set);
- step 2: server response (the client is sent a packet with SYN and ACK flags set);
- step 3: acknowledgment of the client’s readiness to establish the connection (the server is sent a packet with the ACK flag set).
The connection is deemed to be established if all the 3 steps (the so-called TCP three-way handshake) have been successful.
Other terms in this category
Data centerColocationWAFDoS (Denial of Service)DDoS (Distributed Denial of Service)Smurf AttackHostingDedicated ServerVPS/VDSDNS hostingWhat is a GET Request?SSL trafficWhat Is a SYN Flag?What are SYN cookies?Zero Day (0day DDoS) attackWhat is a domain name?BandwidthWhat is a router?What is a server?TrafficRound-Trip Time, RTTInternet Protocol, IPLink bandwidth, link throughputTCP window sizeWhat are cookies?What is a CVE?What Is an Exploit?HacktivismWhat is Proxying?Content Delivery Network, CDNAttack amplificationBotAttacks against websitesWhat is the 95th percentile?What is TLS fingerprinting?TCP handshakeWhat is a DNSBL and how it works?MAC (Media Access Control) address or physical addressDoS (Denial of Service)IP addressProxy serverFirewallP2P network
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