RFC meaning
Request for comments
IETF meaning
Internet Engineering Task
Force
A series of documents that describe methods, protocols, research, or innovations related to the Internet and networking.
RFC (Request for Comments)
An open international community of engineers, researchers, and network designers that develops and promotes voluntary Internet standards.
IETF (Internet Engineering Task Force)
They define the format, order of messages sent and received among network entities, and actions taken on message transmission, receipt
Protocols
different channels transmitted in different frequency bands
frequency division multiplexing (FDM)
asymmetric: up to 40 Mbps – 1.2 Gbps downstream transmission rate, 30-100 Mbps upstream transmission rate
HFC: hybrid fiber coax
DSL meaning
Digital Subscriber Line
▪ use existing telephone line to central office DSLAM
* data over DSL phone line goes to Internet
* voice over DSL phone line goes to telephone net
▪ 24-52 Mbps dedicated downstream transmission rate
▪ 3.5-16 Mbps dedicated upstream transmission rate
Digital subscriber line (DSL)
▪ typically within or around building (~100 ft)
▪ 802.11b/g/n (WiFi): 11, 54, 450Mbps transmission rate
Wireless local area networks
(WLANs)
Wide-area cellular access networks
provided by mobile, cellular network operator (10’s km)
▪ 10’s Mbps
▪ 4G/5G cellular network
sends packets of data
Host
