Answer:
event based and time based
Explanation:
OTP tokens come in two types: event-based (HOTP) and time-based (TOTP). Event-based OTP tokens generate new codes at the press of the button and the code is valid until it is used by the application. Time-based OTP tokens generate codes that are valid only for a certain amount of time (eg, 30 or 60 seconds), after which a new code must be generated
Answer:

Explanation:
Considering the number are stored using binary notations.
If there are total 86 bits and 1 bit is used as sign bit. Then in total one can have
bit combinations since a bit can be either stored as 0 or as 1.
Therefore, the largest number that can be stored will be
.
To understand it in better way let's scale down the problem to 3 bits representation. The largest number that can be stored using 3 bits is 111 which in decimal form is 7 and is equal to
.
Answer:
b. Using either the read-write or read-only community string.
Explanation:
The SNMP agent on a router authenticates any SNMP Get requests received from the NMS using either the read-write or read-only community string.
In the SNMPv2c, if the NMS sends either the read-write or read-only community string requests, SNMP Get requests will be allowed.
No they are images that are free to use as long as your not using them to make profit and you give credit to the person who owns the image.