Free TCP Analysis Poster

TCP Analysis Cheat sheetDownload This 18"x24" color poster (see below) depicts the fields of the TCP header and includes details on: - TCP options - Relative Sequence Numbering in Wireshark - TCP Flag settings (including Nonce, CWR, and ECE) - Hot Wireshark filters for TCP analysis - SYN, SYN/ACK, and ACK header structures - Retransmissions … Continue reading Free TCP Analysis Poster

SSL/TLS Make it simple.

Secure Sockets Layer, or SSL (pronounced as separate letters), is a protocol which is used to communicate over the Internet in a secure fashion. It was replaced by Transport Layer Security, or TLS, in 1999. Today, the term SSL is still widely used, although in practice SSL has been fully replaced by TLS. So lets … Continue reading SSL/TLS Make it simple.

MTU & MSS Explained.

A maximum transmission unit (MTU) is the largest packet or frame size, specified in octets (eight-bit bytes) that can be sent in a packet- or frame-based network such as the internet. The internet’s transmission control protocol (TCP) uses the MTU to determine the maximum size of each packet in any transmission. MTU is usually associated with … Continue reading MTU & MSS Explained.

Overview of IPSEC VPN

Virtual Private Networks (VPNs) provides a secure tunnel across a public (and thus, insecure) network. This provides a mechanism for organizations to connect users and offices together, without the high costs of dedicated leased lines. VPNs are most often used across the Internet, the world’s largest public network, providing users with access to email, documents, … Continue reading Overview of IPSEC VPN

Introduction to VTP (VLAN Trunking Protocol)

VLAN Trunk Protocol (VTP) reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. VTP is a Cisco-proprietary protocol that is available on most of the Cisco Catalyst series … Continue reading Introduction to VTP (VLAN Trunking Protocol)