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Why do we need an operating system
- Manages hardware components - Sits between hardware and application - User interface (GUI AND command ui) - File management
Ntp
123
SNMP
161 162
FTP
20, 21
SSH
22
Telnet
23
SMTP
25
RDP
3389
HTTPS
443
DNS
53
DHCP
67 68
HTTP
80
tcp
A connection-oriented transport layer protocol. more secure
Stages of DHCP
Discovery find dhcp server Offer dhcp offers ip Request : aks to use it Acknowledge: leases ip
ICMP is on what layer and what does it do ?
Internet control message protocol 3rd layer Ping our trace route to figure out connectivity issues
What is the core of an operating system?
Kernel
Which OSI layers happen in network
Lower 1 2 3 4
Layers of OSI
Physical data link network transport session presentation application
TCP handshake
SYN SYN ACK ACK
Which OSI layers happen in host machine
Upper 7 6 5
OSI stands for?
open system integration model