NetCat

In simple words Netcat is a Unix utility which reads and writes data across network connections, using TCP or UDP protocol. That’s it. But because its such a reliable back end tool which offers rich features for network debugging and exploration it would stupid not learn about it. It is used from the command terminal …

ICMP Codes

ICMP codes often come handy when you are trying to find the status of a remote host. ICMP Type Message 0 Echo reply 3 Destination unreachable 4 Source quench 5 Redirect 8 Echo 9 Router advertisement 10 Router selection 11 Time exceeded 12 Parameter problem 13 Timestamp 14 Timestamp reply 15 Information request 16 Information …

NetBios

NETBIOS is a service which allows communication between applications such as printer or other computer in Ethernet or token ring network via NETBIOS name. NETBIOS name is 16 digits long character assign to a computer in workgroup by WINS for name resolution of an IP address into NETBIOS name. Workgroup VS Domain Workgroup: It is …

AAA services

AAA stands for authentication Authorization and Accounting. We all know the importance of AAA services in any network. There are numbers of ways to implement AAA services. The most commonly used are Tacacs+ Radius TACACS+ RADIUS Terminal Access Control Access Control Server Remote Authentication Dial-In User services. Cisco proprietary protocol open standard protocol It uses …