With ad hoc wireless LANs, there are no access points; therefore, the radio cards must send beacons. The ad hoc mode of operation transpires as follows: 1. After a user switches to ad hoc mode, the radio card begins sending beacons if one is not received within a specific period of time. 2. After receiving a beacon, each radio card waits a random period of time. 3. If a beacon is not heard from another station in this time, then the station sends a beacon. The random wait ..
One of the biggest reasons everything is a target is because nearly everything can be used as a weapon, and an attacker is motivated to acquire weapons to wield against future targets. So, nearly every successful attack has not only a direct result for the attacker, but an indirect result in that the attacker gains an additional weapon to use against new targets. For example, if an attacker is able to compromise a Dynamic Host Configuration Protocol (DHCP) server, consider th..
SDLC is a serial protocol that is commonly used for SNA devices. It is extremely popular in financial environments for devices such as banking machines, card readers, and account printers. Using SDLC in conjunction with DLSw is becoming increasingly common in these sorts of situations. This allows the remote SDLC devices to communicate with the Token Ring Interface Coupler (TIC) on a mainframe computer through an IP network. There is a huge advantage to this because it means ..
Influencing the Choice of Best Route for Summary Routes
Often, engineers plan route summarization for the same address block on multiple routers. Such a design takes advantage of redundancy and can be used to perform basic load balancing of traffic across the various paths through the internetwork. Figure 1-2 shows one such example, with Routers WAN1 and WAN2 summarizing routes for the two address blocks located on the branch office LANs: 10.11.0.0/16 and 10.12.0.0/16. Figure 1-1 Figure 1-2 Choosing Locations for Route Summa..
You can prevent an interface from participating in RIP with the following set of commands: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#access-list 12 deny any Router1(config)#router rip Router1(config-router)#passive-interface FastEthernet0/1 Router1(config-router)#distribute-list 12 in FastEthernet0/1 Router1(config-router)#end Router1# you enable RIP on an interface with a network command. But because RIP e..
