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Problem (a) The IEEE 802 series of standards describe both the Physical and Data Link layers of their respective technologies. Two important standards are 802.3 and 802.5, respectively known as CSMA/CD (Ethernet) and Token Ring.
i. Explain how CSMA/CD operates and describe how Ethernet deals with collisions.
ii. Give the structure of a typical Token Ring frame and explain how communication is effected in a Token Ring Network.
Problem (b) A datagram of 3000 bytes has to travel over a network with a MTU size of 1000 bytes. Explain how fragmentation can be used to solve this problem.
You should give the value of the 3 key fields used in fragmentation for each fragment created.
Problem (c) Nowadays many companies are shifting towards the IEEE 802.11x standard for extending their network.
i. Outline two popular flavours of this wireless standard. Elaborate on the operating frequency, range and speed of each flavour.
ii. What are the two modes of operation of this standard and explain the difference between the two.
iii. Mention one security issue with this wireless technology and explain how this issue can be addressed.
(a) What are the different architectures for wireless networks? (b) Explain how WEP authentication and encryption works, describe the vulnerability. (c) In what ways are secu
ARP MESSAGE FORMAT Although the ARP data packet format is sufficiently general to allow hardware addresses and arbitrary protocol. ARP is almost usually used to bind a 32-bit
Network-Based IDS (NIDS) A NIDS resides on computer or appliance connected to segment of an organization’s network and looks for signs of attacks. While examining packets, a NID
There are various benefits related with providing the security. They are given below, (i) Confidentiality/ Privacy (ii) Integrity (iii) Availability (iv)Authenticatio
Question : a) Below is a capture of an Ethernet II frame which contains an IPv4 packet and a TCP segment. Give the source MAC address for the frame in hexadecimal; the source I
In the early days when there were some dozen computers machine on the network, it was done individually but now as we have looked that there are millions of computers on the intern
implementing password policy in organisation
FRAGMENT IDENTIFICATION: IDENT field in every fragment matches IDENT field in real datagram. Fragments from different datagrams may arrive out of order and still be saved out.
(a) Show four Network Security attacks. How do they compromise security? (b) In what ways do the following devices or services contribute to security: (i) Firewall (ii) In
Risk Determination For purpose of relative risk assessment, risk equals probability of vulnerability occurrence TIMES value MINUS percentage risk already controlled PLUS an elem
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