Category Archives: CCNA
WAN Protocols
HDLC, PPP, and Frame-Relay What is HDLC? HDLC stands for High-Level Data Link Control protocol. Like the two other WAN protocols mentioned in this article, HDLC is a Layer 2 protocol . HDLC is a simple protocol used to connect … Continue reading
Configuring Network Address Translation
When you configure NAT, it is sometimes difficult to know where to begin, especially if you are new to NAT. These steps guide you to define what you want NAT to do and how to configure it:
Classful vs Classless Addressing
All IP addresses are composed of two parts : Network (or prefix) Host (or Node) Originally, all IP addresses were classful – they belonged to Class A, B, C or D. Class D is for Multicast and is rarely used. … Continue reading
What Is a TCP/IP Routing Table?
A routing table is used by TCP/IP network routers to calculate the destinations of messages it is responsible for forwarding. The table is a small in-memory database managed by the router’s built-in hardware and software.