Basics Flashcards
What is Multiplexing?
Allows multiple people to use a baseband connection at the same time.
Logical link control
Provides basic error control functions
What is windowing in TCP
Allows clients to adjust amount of data in each segment
What is Buffering
Occurs when devices allocate memory to store segments if bandwidth isn’t readily available
Application Services
Layer 7.
Unites communication components from more that one network application
Service Advertisements
Sending out of announcements to other devices on the network to state the services they offer.
What is a port?
A logical opening on a system representing a service or application that’s listening and waiting for traffic.
IPv4 Packets contain…
*Source address
*Destination address
*IP flags
*Protocol (UDP/TCP).
Define Bandwidth
Theoretical measure of how much data could be transferred from a source to its destination
Define Throughput
Actual measure of how much data is transferred from a source to its destination.
Explain Traffic Filtering
Permits or denies traffic based on IP addresses or application ports.
Broadcast Storm
Multiple copies of frames being forwarded back and forth which then consumes the network.
Dedicated Leased Line
Logical connection that connects two sites through a service provider’s facility
Circuit-Switched Connection
Connection is brought up only when needed, similar to making an phone call.
Packet-Switched Connection
Works like an always-on dedicated lease line, but multiple customers share the bandwidth
Channel Service Unit/Data Service Unit (CSU/DSU)
Terminates the digital signals a the customer’s location.
Speed of a T1 line?
1.544 Mbps
Metro Ethernet
Terminates the digital signals a the customer’s location with an Ethernet instead of a specialized CSU/DSU serial port.
Cable Modems
Made up of a hybrid firber-coax (HFC) distribution network
Data-Over-Cable Service Interface Specification (DOCSIS)
For cable modems
Plain Old Telephone Service (POTS)
Runs on public switched telephone network (PSTN) which consists of all telephone carriers from around the world.
Integrated Services Digital Network (ISDN)
An older technology designed to carry voice, video, or data over B (bearer) channels.
Primary Rate Interface (PRI)
*1.472 Mbps data path
*Over 23 B channels and a 64 Kbps D channel.
Synchronous Optical Network (SONET)
*Layer 1 technology
*Uses fiber
*51.84 Mbps (OC1) to 159.25 Gbps (OC-3072)
