NEtwork infrastructure devices

Question 1

Network Infrastructure

Answer 1

Primary devices used in our networks

Question 2

Hub

Answer 2

▪ Layer 1 device used to connect multiple network devices/workstations
▪ Known as multiport repeaters
▪ Three basic types of Ethernet hubs:
● Passive hub
o Repeats signal with no amplification
● Active hub
o Repeats signal with amplification
● Smart hub
o Active hub with enhanced features like SNMP

Question 3

Collision Domains

Answer 3

▪ Multiple network segments connected together by hubs
▪ Hubs (layer 1) were used to connect multiple network segments together
▪ Each LAN segment becomes a separate collision domain

Question 4

Bridges

Answer 4

▪ Bridges analyze source MAC addresses in frames entering the bridge and
populate an internal MAC address table
▪ Makes intelligent forwarding decisions based on destination MAC address
in the frames

Question 5

Switch

Answer 5

▪ Layer 2 device used to connect multiple network segments together
▪ Essentially a multiport bridge
▪ Switches learn MAC addresses and make forwarding decisions based on
them
▪ Switches analyze source MAC addresses in frames entering the switch
and populate an internal MAC address table based on them

Question 6

Layer 2 Switch

Answer 6

▪ Each port on a switch represents an individual collision domain
▪ All ports belong to the same broadcast domain

Question 7

Router

Answer 7

▪ Layer 3 device used to connect multiple networks together
▪ Make forwarding decisions based on logical network address information
● Such as using IP addresses (IPv4 or IPv6)
▪ Routers are typically more feature rich and support a broader range of
interface types than multilayer switches
▪ Each port is a separate collision domain
▪ Each port is a separate broadcast domain

Question 8

Layer 3 Switch

Answer 8

▪ Layer 3 device used to connect multiple network segments together
▪ Can make Layer 3 routing decisions and interconnect entire networks
(like a router), not just network segments (like a switch)