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802.11 WIRELESS LANs AND CSMA/CA:
IEEE 802.11 is standard wireless LAN that needs radio signals at 2.4GHz. Its speed is 11Mbps. The older computers use radio signals at data rate of 2Mbps and 900MHz. Bluetooth specifies a wireless LAN for short places. It needs shared medium and radio signals instead of coaxial cable.
LIMITED CONNECTIVITY WITH WIRELESS:
In contrast with wired LANs, not all methods can be able to reach each other.Because:
This is given in the figure below:
(a) Describe how CSMA/CD operates and explain how Ethernet deals with collisions. (b) Describe how the subsequent protocols work: i. ARP ii. DHCP iii. DNS iv. SMTP (c) The
Gateways They transfer packets among network machines that have different protocols (e.g. between a WAN and a LAN). They access a packet formatted for one protocol and change
differentiate between internet and www
Risk Management Discussion Points Organizations should define level of risk it can live with Risk appetite: it defines quantity and nature of risk which organizations are wil
ENCAPSULATION Network interface layer adds IP datagram as data area in hardware frame. Hardware ignores IP datagram message format. Standards for encapsulation defines details
IPV6 NEXT HEADER It is given in the figure below:
Routers They transfer packets among multiple interconnected network machines (i.e. LANs of different kind). They perform in the data link, physical and network layers. They ha
project on ensuring data securities on cloud computing
types of firewall and backup
Electronic Mail: Electronic mail which is famous as e-mail, as it is known to its number of users, has been around for more than two decades. Before 1990, it was mainly used in
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