Module 1.3

Question 1

At the transport layer, on the sending host, data from the upper layers is packaged as a series of layer 4 _______________

Answer 1

Protocol Data Units (PDUs)

Question 2

Most application protocols require the exchange of multiple messages between the client and server. This exchange of such a sequence of messages is called a _____________

Answer 2

session layer or dialog

Question 3

OSI model layer that provides services for applications that need to exchange multiple messages

Answer 3

session layer

Question 4

OSI model layer that transforms data between the formats used by the network and applications.

Answer 4

Presentation Layer

Question 5

OSI model layer providing support to applications requiring network services (file transfer, printing, email, databases, and so on).

Answer 5

application layer

Question 6

Network scope restricted to a single geographic location and owned/managed by a single organization.

Answer 6

LAN

Question 7

Typically used to refer to network devices designed for small-scale LANs

Answer 7

SOHO

Question 8

Network scope that spans a large geographical area, incorporating more than one site and often a mix of different media types and protocols plus the use of public telecommunications networks.

Answer 8

WAN

Question 9

The _______________ provides the following physical connections

A number of RJ-45 ports (typically four)
Radio antennas to transmit and receive wireless signals
A type of modem (typically cable or digital subscriber line) to connect to the Internet Service Provider’s (ISP’s) network

Answer 9

SOHO Router

Question 10

the RJ-45 jacks are connected internally by an ________________

Answer 10

Ethernet switch

Question 11

At layer 3, the network layer, the routing part of the SOHO router makes forwarding decisions between the local private network and public Internet. These zones are distinguished by________________

Answer 11

internet protocol (IP) addresses

Question 12

The router runs a dynamic host _____________________server to allocate a unique address to each host that connects to it over either an Ethernet port or via the wireless access point.

Answer 12

configuration protocol (DHCP)

Question 13

The SOHO router’s WAN interface is allocated a public IP address, say 203.0.113.1, by the internet service provider. When a host on the local network tries to access any valid IP address outside the 192.168.1.0/24 range, the router forwards that packet over its _________________ and directs any replies back to the host on the LAN.

Answer 13

WAN interface

Question 14

__________________ is essentially a matter of allowing or preventing devices, users, and services (applications) from using the network.

Answer 14

Network security

Question 15

he WAN interface is the network _______________

Answer 15

perimeter