-SSL/TLS could arguably belong to Layer 4 (transport layer) because it sets up a session and sends data bidirectional by using an underlying transport protocol. -These session messages would have to contain some handshaking stuff that is required for the session to be setup.

Layer 6 is for encryption/decryption, and Layer 5 includes managing a communication session in the form of back and forth transmissions between two nodes. The protocol using SSL would be something like HTTP which sits in Application layer, it is the thing SSL is encrypting/decrypting data for. Therefore, SSL is both layer 5 and 6 (but not 7).

2014年6月26日 · In the OSI model it's less defined because encryption is in Layer 6 and session control is in Layer 5. HTTPS (layer 7) uses SSL and SSL (Layers 5/6) uses TCP (Layer 4). SSL negotiation actually starts in Layer 5 and the encrypted tunneling kicks in after the SSL handshake is successful, so I would call SSL an OSI Layer 5 protocol.

2019年6月4日 · L2TPv3, PPTP and IPSEC all establish and operate over the top of IP connections (Network Layer). PPTP uses TCP and GRE, while L2TP and IPSEC Aggressive-mode rely on UDP (all Transport Layer protocols). SSL VPN (which isn't really standardised) relies on HTTPS/TLS depending on the implementation, so you could say it …

2019年3月18日 · Tunneling somewhat defies the strict OSI layering. Usually, layer-3 packets are tunneled over layer 3 (IPsec) or layer 4 (TCP or UDP). An L3 tunnel routes between two networks. When layer-2 frames are tunneled, the networks are bridged together. OpenVPN uses SSL VPN over UDP or TCP (layer 4) with SSL encryption. It can tunnel either L2 or L3.

Mainly people adding a fifth layer at the bottom for the physical stuff or they added a fifth layer beneath the application layer, just to place TLS there. As far as I understand the whole thing, TLS (and the old dying SSL), are situated in the application layer of TCP/IP and acting as a wrapper around other application layer protocols (e.g. HTTP).

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2016年4月16日 · For example, a common scenario is where application layer (HTTP layer 7) header and data has transport layer (TCP - layer 4) bits added to the beginning of it, which has IP (layer 3) bits added to the beginning, which has Ethernet (layer 2) data added to it. The complete message would look something like this:

2020年12月2日 · Will the TLS / SSL inspection throughput affect Uploads and Downloads speeds ( i.e, if we purchase a firewall with TLS/SSL inspection throughput of 500mbps, does that mean we cannot use fully utilize our 1Gbps internet connection.) Depends on whether your backups use SSL as well. Ultimately, it comes down to performance vs. price.

This was SSL version 1.0 (major version 1 minor version 0). In 1995, Netscape came out with SSL version 2.0 (major version 2 minor version 0). In 1996, Netscape came out with SSL version 3.0 (major version 3 minor version 0). In 1999, maintenance of the "SSL" protocol was handed over to the IETF, who renamed it "TLS".