Cisco R 1.7 - 1.9 Flashcards
What is WAN?
A data communications network that operates beyond the geographic scope of a LAN
What kind of Area network connects organizations to external services like data centers, and remote users
WAN - Wide area network
What are the two responsibilities of a router?
To segment LAN and the WAN access connection device
How are WAN connections made?
through a WAN interface on a router
What device is required to connect to the local point of presence (POP)?
CSU- Channel Service Unit/DSU-Data service unit or modem
What type of connection are Modems used for?
Analog connnections, basic dial connections
What type of connections are CSU/DSU used for?
digital lines/connections
What is a CSU/DSU and what do they do?
Channel Service Unit/Data service unit, connects a router to a digital circuit such as a Leased Line or Frame Relay connection
What layer of the OSI model do CSU/DSU operate on?
Layer 1 - physical layer
On a cisco router what part does loopback testing?
The Channel Service Unit/ Digital Service Unit
What is one of the most common types of WAN connections?
point-to-point connections
What is a Frame Relay?
a packet switching protocol, that connects more than two widely scattered LANs
What is (ATM) asynchronous transfer mode and what does it do?
a switching technique used by telecommunication networks that uses asynchronous time-division multiplexing to encode data into small, fixed-sized cells
What is fiber optic communication?
A method of transmitting information from one place to another via pulses of light
What is (SONET) Synchronous optical networking?
protocols that transfer digital data streams at the same time over optical fiber using lasers
