9/3 Class

Question 1

Chapter 2

Answer 1

we are on it

Question 2

Read through chapter 4

Answer 2

do it before we go through it next time

Question 3

TCIP

Answer 3

most data transmitted over a modern networks uses the TCP/IP standards to communicate
has an IP address called a “host”

Question 4

wired networks

Answer 4

based on IEEE 802.3(“ethernet”)

Question 5

wireless networks

Answer 5

based on IEEE 802.11

Question 6

data types are layered

Answer 6

message or data(HTTP, SMTP, etc)
segments(TCP) or Datagrams(UDP)
packets(IP)
frames(ethernet)

Question 7

Protocol Data Unit (PDU)

Answer 7

used generically is a simple unit, but often used for higher-level layers (above IP)

Question 8

unicast traffic

Answer 8

traffic sent from one system to another one
one to one traffic
can traverse subnets

Question 9

multicast traffic

Answer 9

traffic sent from one system to many other systems

Question 10

broadcast traffic

Answer 10

traffic sent from one system to all other systems on a network

Question 11

ARP

Answer 11

maps ethernet addresses to IP adresses)

Question 12

routers and broadcasts

Answer 12

separate subnets

routers don’t pass broadcasts it would overload the internet

Question 13

network interface cards (NICs) and cables

Answer 13

connect systems

Question 14

collision domain

Answer 14

only one system can send data at any given time
collisions occur and the protocols force a resend
switches create separate collision domains to minimize collisions

Question 15

broadcast domain

Answer 15

all devices on a network can receive broadcast traffic
excessive broadcasts slow a network
routers create separate collision and broadcast domains

Question 16

Hubs (no longer common)

Answer 16

system NICs connect to physical ports there are collisions but they are resent

Question 17

switches

Answer 17

system NICs connect to physical ports on the Hub via a cable
data sent to one physical port is forwarded to specific physical ports, not all ports(creates isolated collision domains which scales much better)

Question 18

bridge

Answer 18

four port bridge creating four collision separate domains(rather than hour connected hubs and one collision domain)(scales better)
most often seen in connecting a wireless network

Question 19

routers

Answer 19

two subnets connected by a router, which “routes” IP packets
1 (Hub)+5(switch) = 6 collision domains
two broadcast domains

Question 20

many routers

Answer 20

each router separates subnets to prevent traffic

Question 21

gateway

Answer 21

each system has a preconfigured default router address… otherwise it would never communicate with other systems on other subnets… such as the internet

Question 22

firewalls

Answer 22

prevents flow of data to specific IP addresses and TCP ports
by default firewalls are very restrictive
network based and/or host based firewalls

Question 23

media types

Answer 23

twisted pair cables
fiber optic - type of glass
wireless

Question 24

submarinecablemap.com

Answer 24

shows you where the fiber optic cables go

Question 25

twisted pair cables

Answer 25

straight cable
crossover cable
use for similar systems

Question 26

protocols

Answer 26

provide rules for communication
based on standards issued by standards organization
must be configured properly to keep data flowing
TCP/IP protocol suite
primary networking protocol in use today

Question 27

services

Answer 27

software applications running on a windows server

Question 28

intranet

Answer 28

protection from the internet

Question 29

perimeter network

Answer 29

between internet and intranet to isolate subnets/systems

DMZ - demilitarized zone

Question 30

extranet

Answer 30

for connecting semi trusted networks, typically business partners
across the internet via WAN connections

Question 31

OSI model

Answer 31

7 Application - SMB, SMTP, etc
6 Presentation
5 Session - establishes, maintains, and terminates lasting connections between two systems
4 Transport - handles flow control, reliability, and error checking of data traveling on this layer, ports are here
3 Network - packets
2 Data Link - handles data delivery on the LAN moving in frames
1 Physical Layer - physical media, encoding signals, ethernet, typical devices
Please do