Enterprise Network
Enterprise network remote Internet is a wide area network WAN connectivity, Internet Internet rather than
small business network: a router, switch, AP
large enterprise networks: core layer, convergence layer and access layer. Consider availability, stability, scalability, security, manageability, redundancy.
Transmission medium
Coaxial: common old televisions, maximum transmission distance of 500 m (thick), 185 m (fine)
UTP: cable, the maximum transmission distance of 100 m.
Fiber: The maximum transmission distance of 2000 m (single-mode) 316 m (multimode)
serial cable
Collision domain
half-duplex (walkie-talkie), full-duplex
SecureCRT If you can not complete, Session Options - Connection -Telnet check the "mandatory character at a time mode"
<AR1> System -view // enter the system mode Sysname AR1 // Set the name of the router AR1 interface of GigabitEthernet 0 / 0 / 0 // enter the interface g0 DIS ip int BRI // display interface information ip ip address 10.1 . 1.1 24 // adding to the interface ip address and mask Run the display the this // displays current information quit // exit the current mode of the ping 10.1 . 1.2 // test network the user-interface vty 0 4 // enter user virtual terminal interface @ cipher password authentication HUAWEI SET 123 // set the remote password <AR2 of> ip address 10.1 . 1.2 24 // add ip address and mask for the interface Telnet 10.1 . 1.1 // Telnet AR1
OSI model and TCP / IP
According IEEE8.2.3 Ethernet standard management and control frames
IEEE: Institute of Electrical and Electronics Engineers of Electrical's and Electronics Engineers Institute
IOS: International Organization for Standardization Organization for Standardization International's
of the OSI model
Open Systems Interconnection Open System Interconnection
Application Layer 7: protocol data units PDUs
6 Presentation Layer: data formatting, encryption, decryption,
5 session layer: establishment, maintenance, management session
4 Transport Layer: Segment data segments, the establishment, maintenance, management of end to end connection. Protocol: the TCP / the UDP
. 3 Network layer: Packet Packet, IP addressing and routing. Protocol has 2 ^ 8
2 data link layer: a data frame Frame, controls communication between the network layer and the physical layer
1 physical layer: the bit stream transmission
VLAN: Virtual Local Area Network Virtual Local Area Network
TCP / IP model: an application layer, transport layer, an Internet layer, network interface layer
Ethernet frame
Two common packaging formats: 802.3 Ethernet format and type 2
Length / Type> = 1536 is an Ethernet type 2
D.MAC | S.MAC | the Type | the Data | the FCS
Length/Type<=1500是802.3型
D.MAC | S.MAC | Length | LLC | SNAP | Data | FCS
OUI: Organizationally Unique Identifier UNIQUE identifier the Organizationally
MAC address 48, the first 24 bits are the OUI, 24 by the manufacturer after the custom
MAC classified
unicast mac (01001100) = last bit of the first byte 0
multicast mac (00000001 ) last bit of the first byte = 1,01005E (classical multicast mac)
broadcast mac (11111111) last bit of the first byte = 1
IP addresses
32, in dotted decimal notation
IP addressing: the network host bits + bits, distinguished by a subnet mask
VRP: Generic Routing Routing Platform Software Platform Versatile
FTP: two ports 21 (transmission control command) and 20 (data transfer) File Transfer Protocol File Transfer Protocol
upgrade the VRP generally use the FTP protocol, based on TCP protocol.
<SW2> interface Vlanif 1 // enter the interface vlan 1 IP address 10.1 . 1.4 24 // is a vlan interfaces add the IP address of ping 10.1 . 1.3 // communication network to test the display Version // display vrp version ftp Server enable // Open ftp server Run the display ftp -server // display ftp server information aaa // authentication, authorization, statistical local-ftp1 the user password the Simple HUAWEI @ 123 // add user and password ftp1 local-fty1 the user privilege Level 15 // set up access local- user ftp1ftp -directory Flash: // shared ftp directory local ftp1 the User-Service-of the type ftp // The user service to any agreement . ftp1 the Save ZIP // save the system configuration file ftp1.zip <SW1> interface Vlanif 1 // enter Interface vlan 1 ip address 10.1 . 1.3 24- // is vlan 1 interface to add IP addresses ftp 10.1 . 1.4 // Log in ftp server GET ftp1. ZIP // from the file server to download ftp1.zip