CS 457, Fall 2004

Computer Networks

Homework 1

Please mark the single best answer for each of the following multiple choice questions:

1. Packetization of messages
(a) is an encryption mechanism that enforces network security
(b) helps prevent a single sender from monopolizing a shared communication link for an arbirtary amount of time
(c) is an algorithm for data encoding in the physical layer
2. The traditional phone network is:
(a) circuit switched
(b) datagram packet switched
(c) niether of the above
3. The layered network architecture:
(a) refers to a type of network hardware
(b) defines an interconnection topology of multiple communication networks
(c) is a way of creating multiple levels of commuication abstractions
4. The Internet is large and heterogeneous. However, it has a few invariables that define its architecture, such as:
(a) the used hardware platform
(b) the used addressing scheme
(c) the used physical layer protocol
5. Circuit switching has the advantage of:
(a) requiring a signalling phase
(b) very efficient allocation of shared resources
(c) offering guaranteed conection bandwidth if needed
6. "Store and forward" most commonly refers to:
(a) a congestion control algorithm
(b) a way of handling packets at network nodes
(c) a signalling protocol in virtual circuit packet switched networks
7. In network terminology, ATM most generally refers to:
(a) a type of network adaptor
(b) a set of standards that define a network architecture
(c) a physical communication medium
8. The Internet is predominantly:
(a) circuit switched
(b) datagram packet switched
(c) niether of the above
9. Which of the following is generally NOT a function of the network layer?
(a) forwarding messages from source to destination
(b) interpretting destination addresses for routing purposes
(c) ensuring that every packet is received reliably
10. TCP is:
(a) a physical layer protocol
(b) a network layer protocol
(c) a transport layer protocol