Recent questions tagged goclasses-cn-practice-questions

The routing table of a router is shown below:\[\begin{array}{|l|l|l|}\hline\text{Destination} & \text{Subnet Mask} & \text{Interface} \\\hline140.24.56.0 & 255.255.254.0 ...

A university campus is redesigning its legacy Ethernet network (Classic CSMA/CD) that operates at $1$ Gbps. The network engineers have specified that the maximum possible...

A CSMA/CD protocol is surprisingly used on a geostationary satellite link between two ground stations. The data transmission rate on the link is $100$ Mbps . The distance...

A network contains $6$ routers P1 to P6 interconnected with the following link costs:  Routers exchange information using a distance vector algorithm.Once routing stabili...

Consider a network of $6$ routers, A1 to A6 with link costs as shown in the following diagram:  Assume a standard distance vector routing protocol is used.Initially, some...

A CSMA/CD network operates at $1 ~\text{Gbps}$ with a minimum frame size of $512 ~\text{bytes}$. The maximum segment length allowed is $200 ~\text{meters}$. If the data r...

In a CSMA/CD network, the bandwidth is $100 \text{Mbps}$ and the minimum frame size is $512 ~\text{bits}$. If the network segment length is increased by $50 \%$ and the d...

You are given the network $\verb|10.1500.0.0/19|$. You need to create multiple subnets where each subnet must have exactly $\mathbf{1022}$ usable hosts.What is the maximu...

A sender uses the Selective Repeat ARQ protocol.Frame size $=2000 \text{bits}$ Sender transmission rate $=500 \mathrm{Kbps}$ $(1 \mathrm{Kbps}=1000 \mathrm{bps})$ ACK siz...

A network engineer is analyzing a link that uses the Stop-and-Wait ARQ protocol. The data frames are $\mathrm{2000 ~bytes}$ in size and are sent at a rate of $\mathrm{125...

In a Go-Back-N ARQ protocol with a window size of $7$, every $\mathbf{4th}$ packet is lost in the forward path.If the sender sends $12$ packets, how many total transmissi...

A token bucket regulator has a bucket capacity of $\mathrm{1 ~MB}$ and a token arrival rate of $\mathrm{10 ~Mbps}$ .If the bucket is initially full, what is the maximum t...

Consider a Selective Repeat sliding window protocol that uses a frame size of $\mathbf{2 ~KB}$ to send data on a $\mathbf{2 ~Mbps}$ link with a one-way latency of $\mathb...

An IP datagram of $4000 ~\text{bytes}$ (including $20$-$\text{byte}$ IP header) passes through a network with $\text{MTU} = 1500 ~\text{bytes}$How many fragments are crea...

If the data from the upper layer is $40 ~\text{bytes}$, how many bytes of padding are added at the Data Link Layer to form a valid Ethernet frame (excluding Preamble and ...

$\text { Consider a network running a link-state routing protocol with the following topology: }$The numbers represent link costs. Router A needs to compute the shortest ...

Consider a TCP connection where the congestion window varies between $\mathrm{W}$ and $\mathrm{W} / 2$ due to periodic packet losses caused by congestion. The round-trip ...

Consider a TCP connection using AIMD (Additive Increase Multiplicative Decrease) congestion control. The current congestion window size is $\mathbf{2 4 ~MSS}$. A timeout ...

An IP datagram of size $\mathbf{2400} ~\textbf{bytes}$ (including IP header) passes through two networks with different MTUs:Network A: MTU $= 1500 ~\textbf{bytes}$ Netwo...

Consider an IP datagram of $\mathbf{1500 ~bytes}$ (including the IP header) that must be sent over a network with an MTU of $\mathbf{576 ~bytes}$. The IP header size is $...

A company has been assigned the IP block $\verb|192.168.10.0/24|$.The network administrator wants to create $\mathbf{6 ~subnets}$, each capable of accommodating at least ...

A TCP connection has a Round Trip Time (RTT) of $100 ~\text{ms}$ and a segment size ($\textbf{MSS}$) of $1,000 ~\text{bytes}$If TCP is operating in congestion avoidance p...

During TCP congestion control, the congestion window ($\text{cwnd}$) increases from $8 ~\text{MSS}$ to $16 ~\text{MSS}$ over several round-trip times (RTTs).Assume no pac...

A leaky bucket algorithm is configured to leak at a constant rate of $\mathbf{1,000}$ bytes per second. The bucket capacity is $\mathbf{5,000}$ bytes.Packets of $\mathbf{...

A network link uses a token bucket for traffic shaping with a bucket size of $\mathbf{10,000}$ tokens and a token generation rate of $\mathbf{2000}$ tokens per second. Ea...

A leaky bucket algorithm is used for traffic shaping. The bucket leaks at a constant rate of $\mathbf{10 ~KB/s}$ and has a capacity of $\mathbf{3 0 ~ K B}$ .A burst of $\...

In TCP congestion control, suppose the congestion window ($\mathrm{cwnd}$) is currently $12$ $\mathrm{MSS}$ and the threshold ($\mathrm{ssthresh}$) is $8$ $\mathrm{MSS}$....

A TCP connection uses additive increase and multiplicative decrease for congestion control. Suppose the congestion window size (cwnd) just before a loss is $16$ segments....

Consider a network using Ethernet and IPv4 without any options field in the header.Each Ethernet frame can carry up to $1600 \textbf{ bytes}$ in its data portion. A UDP s...

Consider a network that uses Ethernet and IPv4. Assume that IPv4 headers do not use any options field. Each Ethernet frame can carry a maximum of $1400 \textbf{ bytes}$ i...