Network Devices

Question 1

Router

Answer 1

OSI layer 3
routes traffic between IP subnets
often connects diverse network types

Question 2

Switch

Answer 2

OSI layer 2
forwards based on MAC address
high bandwidth
hardware bridging ASICS
core of an enterprise network

Question 3

multilayer switch

Answer 3

switch with a router inside

Question 4

firewall

Answer 4

OSI layer 4 (TCP/UDP) 
some filter through layer 7
filters traffic by port number
can encrypt traffic into and out of the network and between sites
can proxy traffic
can be layer 3 devices (routers)

Question 5

IPS/IDS

Answer 5

protects against OS and application exploits
detection - alerts but does not stop the attack
prevention - blocks the attack
network based - high speed appliances
host based - runs on your OS

Question 6

Hub

Answer 6

OSI Layer 1
multiport repeater
half duplex
less efficient as speeds increase

Question 7

Analog modem

Answer 7

Modulator/Demodulator
uses standard phone lines
POTS modems now used for back and utility functions

Question 8

packet Shaper

Answer 8

control by bandwidth usage or data rates
set important applications to have higher priorities than other apps
manage the Quality of Service (QoS)

Question 9

VPN concentrator

Answer 9

the connection point for remote users

traffic is encrypted across the internet and decrypted on the internal private network