Network Questions help Please.?

1. Which of the following concepts is NOT involved in network security?

a. Policies

b. Physical security

c. Terminal security

d. Object-oriented security

e. Data security

2. Which of the following is NOT a point-to-point digital circuit?

a. T-1

b. T-3

c. Frame Relay

d. E-1

3. Which of the following is NOT a WAN application issue that data network applications can be separated into?

a. Conversational

b. Networking

c. Bulk data transfer

d. Inquiry/response

e. Remote job entry

4. Which one of the terms below correctly matches the following definition, as stated in the course textbook?

Protocols check for errors, acknowledge correctly received data blocks, and send repeat requests when blocks contain an error. Sophisticated protocols can acknowledge multiple packets using one of two procedures. A selective repeat acknowledgment enables the receiving device to request the sending end to resend specific packets. In the go-back-N method, the receiver instructs the sender to resend an errored packet and all subsequent packets.

a. Link management

b. Communications control

c. Error detection and correction

d. Full duplex mode