Access Control Lists (ACLs) - A basic form of firewall protection
Access Point (AP) - A transceiver used to interconnect a wireless and a wired LAN
Attention-to-Cross talk Ratio (ACR) - ACR measurement compares the signal level from a transmitter at the far end to the cross-talk measured at the near end. A larger indicates that the cable has a greater data capacity
Address Resolution Protocol (ARP) - used to map an IP address to its MAC address
Asymmetric DSL (ADSL) - A service providing up to 1.544 Mbps from user to the service provider and up to 24 Mbps back to the user from the service provider.
Advanced Encryption Standard (AES) - It is a symmetric block cipher chosen by the U.S. government to protect classified information and is implemented in software and hardware throughout the world to encrypt sensitive data. AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data.
Autonomous System (AS) - An autonomous system (AS) is a network or a collection of networks that are all managed and supervised by a single entity or organization. An AS is a heterogeneous network typically governed by a large enterprise.
Attenuation - The amount of loss in the signal strength as it propagates down a wire, fibre or aerially
