Practice MAC Address Me ia Access Control address uniquely Data Link Cont n r t o r l Logical Link Control Media Access Control

Transcription

1 Practice MAC Address What is a MAC Address? Short for Media Access Control address, a hardware address that uniquely identifies each node of a network. In IEEE 802 networks, the Data Link Control (DLC) layer of the OSI Reference Model is divided into two sub layers: the Logical Link Control (LLC) layer and the Media Access Control (MAC) layer. The MAC layer interfaces directly with the network medium. Consequently, each different type of network medium requires a different MAC layer. On networks that do not conform to the IEEE 802 standards but do conform to the OSIR Reference Model, the node address is called the Data Link Control (DLC) address.

2 Practice MAC Address How to check a MAC Address? C:\ipconfig /all This is MAC Address.

3 Practice MAC Address 8C A9 82 9B 5A A6 Vendor ID p// / / Quiz) Which company is ?

4 Practice ARP/RARP What is ARP/RARP? Short for Address Resolution Protocol, a network layer protocol used to convert an IP address into a physical address (called a DLC address), such as an Ethernet address. A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP network. The host on the network that has the IP address in the request then replies with its physical hardware address. There is also Reverse ARP (RARP) which can be used by a host to discover its IP address. In this case, the host broadcasts its physical address and a RARP server replies with the host's IP address.

5 Practice ARP/RARP How to check an ARP table? C:\arp a

6 Practice ARP/RARP

7 Practice ARP/RARP

8 Practice ARP/RARP

9 Practice ARP Spoofing Host A ARP Cache Host B ARP Cache Host A Host B Normal Communication

10 Practice ARP Spoofing Host A ARP Cache Host B ARP Cache Host B MAC = [Sniffer MAC] Host A MAC = [Sniffer MAC] ARP Spoofing Attack

11 Practice ARP Spoofing Host A ARP Cache Host B ARP Cache After ARP Spoofing Attack

12 Demonstration ARP Spoofing ARP Cache Poisoning

13 Practice What is ICMP? Short for Internet Control Message Protocol, an extension to the Internet Protocol (IP) defined by RFC 792. ICMP supports packets containing error, control, and informational messages. The PING command, for example, uses ICMP to test an Internet connection. Quiz) What program is using ICMP without PING?

14 Practice

15 CISCO Router Features The internal structure of the network equipment. CPU Controlling System, Various Operations DRAM Loading of The Code of IOS(Internetwork Operating System), provides the required buffer on each port. Saving the MAC Address Table which is referenced by Switch. Saving the Routing Table which is referenced by Router. The contents of DRAM devices cleared after a reboot. Flash memory Corresponding to the hard disk of Server/PC. Saving OS, Save the setting depending on the equipment.

16 CISCO Router Features NVRAM(non volatile RAM) Saving Configuration File The contents of NVRAM are not erased in restarting. ROM(read only memory) Saving the code in order to work IOS When a machine fails, Saving the minimum IOS in order to recovery.

17 CISCO Router Features LAN Equipment that is associated with the Ethernet Port : Ethernet, Fast Ethernet, Gigabit Ethernet, 10G Ethernet Interface WAN Equipment that is associated with the Port : Serial, ATM, POS(Packet over Sonet), interface Interface or Port

18 CISCO Router Features

19 CISCO Router Features Interface Number (Port Number) (Module Number / Port Number) (Slot Number / Module Number / Port Number)

20 CISCO Router Features Confirming the Interface Router# show ip interface brief

21 Practice Dynagen What is the Dynagen? Dynagen is a front end dfor use with the Dynamips Cisco router emulator. It uses an INI like configuration file to provision Dynamips emulator networks. It takes care of specifying the right port adapters, generating and matching up those pesky NIO descriptors, specifying bridges, frame relay, ATM switches, etc. It also provides a management CLI for listing devices, suspending and reloading instances, determining and managing idle pc values, performing packet captures, etc. Available on the Downloads page is a Windows installer package that t includes Dynamips and Dynagen. The only dependency is Winpcap 4.0. RPMs for are now available in the download section. Thanks to Sean Walberg for performing the packaging.

22 Practice Dynagen Homepage Download gen/files/ / /d /f / _win_setup.exe