What is the maximum number of VLANs that can be configured on a switch supportin

Question

What is the maximum number of VLANs that can be configured on a switch supporting the 802.1Q protocol? Why? Suppose that N switches supporting k VLAN groups are to be connected via a trunking protocol. How many ports are needed to connect the switches? Justify your answer. Suppose the information content of a packet is the bit pattern 1110 0110 1001 1101 and an even parity scheme is being used. What would the value of the field containing the parity bits be for the case of a two-dimensional parity scheme? Your answer should be such that a minimum-length checksum field is used. Show (give an example other than the one in Figure 6.5) that two-dimensional parity checks can correct and detect a single bit error. Show (give an example of) a double-bit error that can be detected but not corrected.

Explanation / Answer

Ans: The minimum length checksum field should be 4*4 matrix. For our data, two dimensional (even) parity:

Note: Twodim Parity = Generalization of the simple (onedim) parity scheme:
1. Form an MxN matrix of bits, then
2. Add a (even or odd) parity bit to each row and to each column

1 1 1 0 1 0 1 1 0 0 1 0 0 1 0 1 1 0 1 1 1 1 0 0 0

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