Calculate the total bandwidth efficiency loss in a system where a $10\text{ Mbps}$ link is divided into $n$ circuits, if $k$ circuits are currently idle.

The total wasted bandwidth is $\frac{k}{n} \times 10\text{ Mbps}$. In circuit switching , resources remain reserved even when idle, preventing other sessions from utilizing the capacity.

If a network uses bit stuffing with a flag sequence of $01111110$, how must the transmitter modify a data sequence containing six consecutive ones?

The transmitter must insert a $0$ bit after every $5$ consecutive $1$s. For a sequence of $111111$, the transmitter outputs $1111101$, ensuring the sequence never matches the $01111110$ flag sequence .

Compare the failure recovery of a Datagram network versus a Virtual Circuit network if a single link along the path fails.

In a Datagram network, each packet is routed independently, allowing the system to dynamically bypass the failed link. In a Virtual Circuit network, the entire pre-established path is typically invalidated, requiring a complete session re-establishment .

Determine the role of the Virtual Circuit Identifier (VCI) within a packet header during a switch's forwarding process.

The VCI serves as a local index that a switch uses to map an incoming port and VCI to a specific outgoing port and new VCI, eliminating the need to process the full destination address at every hop.

Explain why bursty internet traffic is better handled by packet switching than circuit switching.

Packet switching allows multiple users to share a link dynamically. Because bursty traffic does not require constant bandwidth, the network can allocate resources only when packets are actually sent, avoiding the waste associated with dedicated circuit reservation .

Analyze the impact of a length field corruption in the byte counting framing method.

If the count field is corrupted, the receiver misinterprets the boundary of the current frame and fails to locate the start of the next frame. This causes a loss of synchronization that propagates to all subsequent frames in the stream.

Calculate the resulting bit sequence if the raw data $01111110$ is processed by a bit-stuffing transmitter.

After $5$ ones, the transmitter inserts a $0$. The original $01111110$ becomes $011111010$. The added $0$ ensures the flag pattern does not accidentally appear in the payload.

Describe the transition of a frame from a host's CPU to the physical medium via the NIC .

The NIC (Network Interface Card) receives a datagram from the network layer, encapsulates it into a physical frame (adding headers/trailers), and performs the signaling required to transmit the bit stream onto the wire.

Evaluate why the Data Link Layer is predominantly implemented in hardware .

Hardware implementation within the NIC allows for high-speed processing of framing algorithms and error detection, which would be too slow if performed entirely in software on the host CPU.

Identify the primary difference between the setup phase of circuit switching and virtual circuit switching.

In circuit switching , the setup phase involves reserving physical bandwidth along the path. In virtual circuit switching , the setup phase establishes a logical path and forwarding table entries without requiring exclusive physical capacity for the duration.

If a switch buffer capacity is $B$ packets and the incoming rate exceeds the outgoing rate by $\Delta R$, determine the time $t$ until the buffer overflow occurs.

The time $t$ is calculated as $t = rac{B}{\Delta R}$, assuming the queue starts empty and the arrival rate exceeds the departure rate consistently.

Explain the necessity of framing when the physical layer provides only a raw, continuous bit stream .

Without framing , the receiver cannot distinguish where one unit of data ends and the next begins. Framing adds markers or counts to delineate discrete packets, allowing the receiver to correctly interpret the structured data.

Describe how a forwarding table in a Virtual Circuit switch prevents packet collisions.

The forwarding table maps incoming combinations of Port and VCI to specific outgoing ports. By strictly defining the path for every Virtual Circuit at setup, switches prevent different flows from interfering with each other at the link level.

Compare byte stuffing and bit stuffing in terms of their sensitivity to data patterns.

Byte stuffing relies on escaping specific byte-length markers, making it sensitive to byte-aligned data. Bit stuffing operates at the bit level using a sequence like $01111110$, making it more flexible and independent of byte boundaries within the data.

Switching Paradigms And Data Link Layer Framing Protocols Flashcards

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Switching Paradigms and Data Link Layer Framing Protocols

This deck explores the mechanics of switching architectures and the framing techniques used to manage data flow at the Data Link Layer.

15 cards

intermediate

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by @mail_ento_telidhu

Q: Calculate the <strong>total bandwidth efficiency</strong> loss in a system where a $10\text{ Mbps}$ ...

Q: Given a data sequence containing the flag byte $01111110$, describe the transformation required by t...

Q: If a network uses <strong>bit stuffing</strong> with a flag sequence of $01111110$, how must the tra...

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