Ungyi Tech

Default route: 0.0.0.0 0.0.0.0 20.1.1.2 or 0.0.0.0 0.0.0.0 f0/2 static routeip route 192.168.2.0 255.255.255.0 192.168.10.2

switchport mode accessswitchport port-security show cdp neighborhood ##Switch port-security switchport mode accessswitchport port-security #Enable port securitySwitch(config-if)#switchport port-security ? mac-address #Secure mac address maximum #Max secure addressesviolation #Security violation modeSwitch(config-if)#switchport port-security mac-address ? H.H.H #48 bit mac address #Put Mac addres..

Enable secret > enable password To keep enable mood(privileged level) Enable secret CCNA Enable password CCENT Switch(config)#line console 0 Switch(config-line)#login % Login disabled on line 0, until 'password' is set Switch(config-line)#password ? 7 Specifies a HIDDEN password will follow LINE The UNENCRYPTED (cleartext) line password Switch(config-line)#password basketball Username signal pas..

Running-config is current setting Startup-config is saved setting Boot – POSTs – Find ISO file – find startup config file ISO file 1. Flash 2. 2. TFTP 3. Rom startup config file 1. NVRAM 2. TFTP server 3. System configuration dialog

CCNA 200-125, ICND1, Sec 4: Config Modes, IOS Help, Intro To VLANs //change host name Switch>enable Switch#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#hostname S1 //usage of tab and ? S1(config)#ho? hostname S1(config)#ho S1(config)#hostname ? WORD This system's network name S1(config)#hostname S2 S2(config)# //exec-timeout 0 0 Switch(config)#li..

Three way to process packet in switch. Store-and-forwardCut-throughFragment-free MAC address composition Hexadecimal table and conversion

CCNA 200-125, ICND1, Sec. 3: Hubs, History, and Why Hubs Are HistorySwitch 3 function Switch don't know where is C is, so send it every port except source port.(Flood)And update MAC table as A = F 0Flood MAC address is ff:ff:ff:ff:ff:ff For the second time, switch know which port should send packet.(Forward)Also, update MAC table for PC C Sooner or earlier, switch will complete MAC table. When s..

CCNA 200-125, ICND1, Sec. 3: Hubs, History, and Why Hubs Are History The bridge will down the size of the Collision Domain and increase the number of Collision Domain.Which is lead to more stable network. Bridge work as 2-port switch in wired network But the size of Broadcast domain is same. A switch connection will give you 1 collision domain per pc. Hub: 1 Collision domain, 1 broadcast domainH..

CCNA 200-125, ICND1, Sec. 3: Hubs, History, and Why Hubs Are History - HubAlso know as Repeater. regenerate electronic signal to send it further with strong one.Located in Layer 1, collision domain made in process. - Collision domainThe data will collide when host send data while other send as well - CSMA/CD(Carrier Sense Multiple Access with Collision Detection)Check weather someone send data o..

CCNA 200-125, ICND1, Sec. 2: c - UTP and STPUTP is Unshielded Twisted Pair and good for EMISTP is shielded twisted pare and vulnerable and expensive. - Cooper Cable10BASE-T/ IEEE 802.3/ 10Mbps/ 2 Pair100BASE-T/ IEEE 802.3u/ 100Mbps/ 2 Pair1000BASE-T/ IEEE 802.3ab/ 1000Mbps/ 4 Pair10GBASE-T/ IEEE802.3an/ 10Gbps/4 Pair - Fiber Optic1000BASE-LX/ IEEE 802.3z/ 1000Mbps/ - Crossover and straight-throu..