Embedded Files
Transmission media:
unshielded twisted pair
foiled twisted pair
twisted with aluminum mesh
fiber
wireless Wi-Fi
Categories of twisted copper:
Cat. 5 speed 100 MHz to 100 m (10TBase)
Cat. 5e used in newer systems
Cat. 6 transmission up to 200 MHz
Cat. 7 transmission up to 600 MHz
Classification:
LAN (local area network) - a network of local
WAN (wide area network) – WAN
MAN (metropolitan area network) - a network of city
CAN (campus area network) - a network of campus
Topology:
ring
Bus
star
Active devices LAN:
regenerator
hub (hub)
switch (switch)
VLAN switch
bridge (bridge)
router
transceiver
Methods of transmission and addressing the LAN:
single (unicast)
group (multicast)
Broadcast (broadcast)
Protocols / network layers:
Physical ethernet, token ring
network: IP, TCP / IP
Transport: TCP / IP, UDP
applications: FTP, SMTP, HTTP, TCP / IP, DNS, SNMP
IP address:
It consists of 2 parts, such as the name of the network and host.
4 IP address classes: A, B, C
Classes addresses:
A 1.x.x.x – 126.x.x.x
B 128.z.x.x. - 191.z.x.x
C 192.z.z.x – 223.z.z.x
D
DNS Domain Name System:
Domain Name Serve
DHCP:
Dynamic Allocation of IP Hosts
OSI [Open Systems Interconnection] - Reference Model contains seven layers:
Applications - Determination of the methods of communication software to network services.
Presentation - Identification protocol version.
Physical - physical transmission eg. The cable.
Data - access to data on the media and how to organize.
Network - to provide data to the recipient.
Transport - error monitoring, confirmation of receipt of data.
Session - Establishing two-way communication channel between computers.
Ports:
FTP (File Transfer Protocol) 21 - transferring files
HTTP (Hypertext Transfer Protocol) 80.81 - upload websites
HTTPS (Hypertext Transfer Protocol Secure) 443 - upload web pages with encryption
IRC (Internet Relay Chat) - one of the first Web services provide real-time communication
NTP (Network Time Protocol), 123 - time synchronization
NNTP (Network News Transfer Protocol) 119 - usenet discussion group
POP (Post Office Protocol) 110 - Internet protocol for receiving mail from the application layer
POP3S (Post Office Protocol) 110 - with additional functions
SMTP (Simple Mail Transfer Protocol) 25 - way of e-mail communication
SSH (secure shell) - termonalowa service or console messaging service
TELNET () - one of the first Web services provide real-time communication
DNS (Domain Name System) 53 - Assigning names to the IP address
IMAP (Internet Message Access Protocol) 143 - successor to the POP3
SAMBA () 137-139, 445 - the equivalent of a Windows based network environment
MYSQL () 3306 - MySql database
NFS (Network File System) 11, 2040 - file sharing UDP and TCP
Network tools:
Linux:
ifconfig -a - displays the IP address, DNS, gateway and other [All about]
Windows:
ipconfig / all - displays the IP address, DNS, gateway and other [All about]
netsh - diagnosis of the network [run scripts, preview setup, configuration, diagnostics]
Page updated
Google Sites
Report abuse