Which of the following fragments has a value of $0$ in the More Flag field?

a$.$ The first

b$.$ The second

c$.$ The third

d$.$ The fourth

e$.$ The fifth

To which of the following protocols proxy servers are important?

a$.$ FTP

b$.$ DNS

c$.$ HTTP

d$.$ SMTP

e$.$ POP$3$

Given that at time t: SampleRTT $=10ms,$ EstimatedRTT $=20ms,$ DevRTT $=3ms.$ Find the timeout interval at time $t+1.$

a$.36\mathrm{.}5ms$

b$.11\mathrm{.}2ms$

c$.4\mathrm{.}75ms$

d$.18\mathrm{.}3ms$

e$.27\mathrm{.}5ms$

Which of the following functions can be considered among the most important for a virtual$-$circuit network?

a$.$ Error control

b$.$ Flow control

c$.$ Congestion control

d$.$ Call setup

e$.$ Security

Which of the following protocols uses UDP?

a$.$ DHCP

b$.$ FTP

c$.$ TELNET

d$.$ SMTP

e$.$ HTTP

Suppose an ISP owns the block of addresses of the form $101\mathrm{.}101\mathrm{.}128/17.$ Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. What are the prefixes $($of form a$.$b$.$c$.$d$/$x$)$ for the four subnets?

a$.101\mathrm{.}101.\frac{128}{19},101\mathrm{.}101.\frac{160}{19},101\mathrm{.}101.\frac{192}{19},101\mathrm{.}101.\frac{224}{19}$

b$.101\mathrm{.}101.\frac{128}{20},101\mathrm{.}101.\frac{160}{20},101\mathrm{.}101.\frac{192}{20},101\mathrm{.}101.\frac{224}{20}$

C$.101\mathrm{.}101.\frac{128}{21},101\mathrm{.}101.\frac{160}{21},101\mathrm{.}101.\frac{192}{21},101\mathrm{.}101.\frac{224}{21}$

d$.101\mathrm{.}101.\frac{128}{22},101\mathrm{.}101.\frac{160}{22},101\mathrm{.}101.\frac{192}{22},101\mathrm{.}101.\frac{224}{22}$

e$.101\mathrm{.}101.\frac{128}{23},101\mathrm{.}101.\frac{160}{23},101\mathrm{.}101.\frac{192}{23},101\mathrm{.}101.\frac{224}{23}$

Which of the following answers has correct statement$($s$)?$

a$.$ Forwarding tables are used in both datagram networks and virtualcircuit networks. IP addresses are used for forwarding in both types of networks.

b$.$ Forwarding tables are used in both datagram networks and virtualcircuit networks. IP addresses are used for forwarding in virtualcircuit networks but not in datagram networks.

c$.$ Forwarding tables are used in both datagram networks and virtualcircuit networks. IP addresses are used for forwarding in datagram networks but not in virtual$-$circuit networks.

d$.$ Forwarding tables are used in datagram networks but not in virtual$-$circuit networks.

e$.$ Forwarding tables are used in virtual$-$circuit networks but not in datagram networks.