Ungyi Tech

ip splitclear ip route * #clear all dynamic ip route. Force them.Ctrl + Shift + 6 #exit current command autosummarization router ripno auto #turn off autosummarization In rip routing, router will automatically merge network. Aka as load balanceDebug ip ripclear ip route * undebug allIn this case, R3 can't ping roop 21 or 22. R2 and R3 need to disable autosummarization. Configuration of R1 isn't ..

Rip 1:no subnettingBroadcastauthentication unavailable Ripv2:subnetting supportmulticastAuthentication Router Poisoning. advertise false value to prevent waste of bandwidth. show ip protocolint s 1/0ip rip send version 2orrouter ripversion 2 router ripno auto-summary #disable automatic network summarization

Hub and spoke network Loopback in router Int loopback10 //make loopback address Ip address 11.1.1.1 255.255.255.0 //assign ip address Exit Show int loopback10 You can’t assign 127.x.x.x address because it’s dedicated to loopback. Although the interface you try to is loopback. No int loopback 10 //delete loopback int R2 to R3 need to go through R1. Round-trip time is doubled. Debug ip packet // e..

DNS – translate domain name to ip address ARP - Address Resolution Protocol, set list of mac address that connected to ip address. In router, show ip arp. In PC, arp -a. DHCP – Discover, Offer, Request, Acknowledgement

TCP/ UDP TCP Error correction/ recovery UDP No error detection, no window / Fast speed. -Audio and Video TCP – three-way handshake syn(synchronising), ack(acknowledgement) 2000-byte segment. Server request Seq 6000 as seq 6000 is missing.After receive seq 6000, acknowledge 10000 so host send seq 12000 next time without sending duplicates. Size of window is automatically negotiated between device..

conf tint range f 0/1-12description See administrator for further configuration.

Cisco switch automatically pick up highest speed and duplex In switch, show int f 0/1 FastEthernet0/1 is up, //means physical port Line protocol is up //means logical port FastEthernet Slot#/Port#F 0/1 means slot 0 and port 1. Most switch have only 1 slot. When it comes to modular switch or router

telnet port 23, set line vty 5 15 password to connect remotely line vty 0 15 // this swtich have 16 vty port(0 to 15) password suces telnet 10.1.1.2 connect a switch remotely using connected router unless set enable password on switch, telnet can’t configure anything enable secret CCNA // set enable password as “CCNA” line vty 0 15 privilege level 15 //set highest level to telnet user so no need..

In a switch, Int vlan1 Ip default-gateway 10.1.1.1 255.255.255.0 Ip address 10.1.1.2

Public IP address (WAN)class a: 0.0.0.0 - 127.255.255.255class b: 128.0.0.0 - 191.255.255.255class c: 192.0.0.0 - 223.255.255.255 Private IP address (LAN)class a: 10.0.0 - 10.255.255.255class b: 172.16.0.0 -172.31.255.255class c: 192.168.0.0 - 192.168.255.255