making connections connecting a computer to a lan donna bair-mundy
TRANSCRIPT
Making connections
Connecting a computer to a LAN
donna Bair-Mundy
Network Interface Card
Network Interface Card - pc
Network Interface Card - pc
Network Interface Card - laptop
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Assigning IP address
Finding DNS server
Finding DNS server
Finding DNS server
Finding DNS server
DNS server
DHCP (Dynamic Host Configuration Protocol)
• Computer boots
• Sends “DHCP DISCOVER” packet to DHCP server
• DHCP server sends IP address
Fixed IP address
IP Address
128.171.94.192
UH Network
Subnet
Machine
LIS Subnet
128.171.58.___
UH Network
LIS subnet
Device
LIS Subnet128.171.58.1 Router
128.171.58.2 Office printer
128.171.58.3 Server - Djoser
128.171.58.4 Server - Nut
128.171.58.5 LIS Chair
128.171.58.6 Dr. Harada
128.171.58.7 Dr. Jacsó
128.171.58.8
…
128.171.58.254
128.171.58.255 [Broadcast]
Reservedfor
router
Reserved
UnassignedAlice
Fixed IP address
128.171.58.8128.171.58.8
LIS Subnet IP address
128.171.58.___
UH Network
LIS subnet
Device
LIS Subnet IP address
128.171.58.___
Network part of address
Device
Network part of LIS Subnet IP address
128.171.58.___
10000000.10101011.00111010.___
What we see
What the computer sees
Subnet mask
11111111.11111111.11111111.00000000
1s mask network part of address
0s reveal individual device no.
255.255.255.0
Record it as:
Subnet mask
128.171.58.8128.171.58.8
255.255.255.0255.255.255.0
Default gateway
128.171.58.8128.171.58.8
255.255.255.0255.255.255.0
128.171.58.1128.171.58.1
(Router that forwards traffic to remote subnets)
LIS Subnet128.171.58.1 Router
128.171.58.2 Office printer
128.171.58.3 Server - Djoser
128.171.58.4 Server - Nut
128.171.58.5 LIS Chair
128.171.58.6 Dr. Harada
128.171.58.7 Dr. Jacsó
128.171.58.8
…
128.171.58.254
128.171.58.255 [Broadcast] Reserved
Alice
Ping (echo request)
Are you there?
I’m alive
% ping 128.171.58.11
128.171.58.11 alive
Broadcast ping (echo request)
Are you there?
I’m alive
% ping 128.171.58.255
128.171.58.2 alive
I’m alive
I’m alive
128.171.58.3 alive128.171.58.4 alive
Are you there?Are you there?