unit1 Flashcards
[Unit 1] Which layer of the OSI model does TCP (Transmission Control Protocol) belong to?
transport
The ____________ layer controls the operation of the subnet. A key design issue is determining how packets are routed from source to destination.
network
When the packet arrives at the server, the operating system sees that the packet is requesting a connection. It checks to see if there is a listener, and if so it unblocks the listener. The server process can then establish the connection with the _____________ call.
accept
To talk to someone, you pick up the phone, dial the number, talk, and then hang up. What service is appropriate to do that?
connection-oriented services
A _________________ spans a large geographical area, often a country or continent.
WAN(wide area network)
Point-to-point links connect individual pairs of machines. What is ““Point-to-point transmission with exactly one sender and exactly one receiver called?
Unicasting
in the simplest of terms, one can imagine a company s information system as consisting of one or more databases with company information and some number of employees who need to access them remotely. What is a computer having the data in this model?
server
Since wireless is inherently a broadcast medium, 802.11 radios also have to deal with the problem that multiple transmissions that are sent at the same time will collide, which may interfere with reception. What scheme is used to handle this problem?
Carrier sense multiple access scheme called ALOHA
802.11 transmission is complicated by wireless conditions that vary with even small changes in the environment. At the frequencies used for 802.11, radio signals can be reflected off solid objects so that multiple echoes of a transmission may reach a receiver along different paths. The echoes can cancel or reinforce each other, causing the received signal to fluctuate greatly. What is this phenomeon called?
multipath fading
What are differences between OSI and TCP/IP models?
OSI has seven layers while on the other hand the TCP/IP model has four layers. TCP/IP is just a practical model that follows protocol and OSI is a protocol independent framework.
