Q$1$: $[$CO$1,$ CO$2,$ CO$3,$ CO$4][10$ Marks$]$ Answer the following:

a$)[$CO$1][2$ Marks$]$ Think about the network where all links have a data rate of $1\mathrm{.}2$

iviops anci use iDN$$ with $10$ siots. Assume nost A needs $400ms$ to create a complete

circuit with host $B$ before starting to send the file. How long will it take for the file

to be send from host A to Host B if it is $412KB$ in size?

b$)[$CO$2][1$ Mark$]$ If the same number of objects are retrieved through different HTTP

connections. Which among: non$-$persistent serial, non$-$persistent parallel or persistent

parallel will be faster?

c$)[$CO$3][4$ Marks$]$ Suppose sender A wants to transmit $8$ packets to host B in which

every $4^{th}$ packet is lost. Given a window size of $3,$ calculate and compare the number

of transmissions required in case of Go$-$Back N and Selective Repeat. Also, discuss

the case where less buffer space and sufficiently large bandwidth is available, than

which protocol is best to choose w$.$r$.$t efficiency?

d$)[$CO$4][3$ Marks$]$ Suppose, Host $1$ with IP address $193\mathrm{.}162\mathrm{.}2\mathrm{.}97$ is connected to Host

$2$ with IP address $193\mathrm{.}162\mathrm{.}2\mathrm{.}80$ via two routers RI and R$2.$ Also, RI has two IP

addresses, such as $193\mathrm{.}162\mathrm{.}2\mathrm{.}135$ and $193\mathrm{.}162\mathrm{.}2\mathrm{.}110$ respectively. Similarly, R$2$ has

two IP addresses, such as $193\mathrm{.}162\mathrm{.}2\mathrm{.}67$ and $193\mathrm{.}162\mathrm{.}2\mathrm{.}155$ respectively. The rietmask

used in the retwork is $255\mathrm{.}255\mathrm{.}255\mathrm{.}224.$ For the data provided above, how many

distinct Subnets exists in the Network? Also provide the subnet IDs in each case.