R2. there are two types of redundancy in video
Spatial redundancy is the redundancy within a given image. Intuitively, an image that consists
of mostly white space can be efficiently compressed without sacrificing image quality. Temporal
R1. What are the differences between message confidentiality and message integrity? Can
you have one without the other? Justify your answer.
Confidentiality is the property that the original plaintext message can not be determined
by an attacker who inter
R2. What are the four types of wireless network identified in our taxonomy? Which of
these types of wireless network used?
a) Single hop, infrastructure-based b) Single hop, infrastructure-less c) Multi-hop,
infrastructure-based d) Multi-hop, infrastructu
R1. What does it mean for a wireless network to be operating in infrastructure mode? If the
network is not in infrastructure mode, what mode of operation is it in, and what is the
different between that mode of operation and infrastructure mode?
R2. If all the links in the Internet were to provide reliable delivery service, would the TCP reliable
delivery service be redundant? Why or why not?
Although each link guarantees that an IP datagram sent over the link will be received at the ot
1. What is the name of a network-layer packet? What is the fundamental difference between
a router and link layer switch?
A network-layer packet is a datagram. A router forwards a packet based on the packets IP
(layer 3) address. A link-layer sw
R3. Consider a TCP connection between Host A and Host B. Suppose that the TCP segments
traveling from Host A to Host B have source port number x and destination port number y. What
are the source and destination port numbers for the segments tra
What is the difference between a host and an end system? List the types of end
systems? Is a Web server an end system?
A host and an end system are terms that are used interchangeably meaning that a host
is an end system.
The types of application programs
1. List five nonproprietary Internet applications and the application-layer protocols that they use.
1.application: e-mail application-layer protocol: SMTP
2.application: WEB application-layer protocol: HTTP
3.application: streaming multimedia application