EGEC4120 - Telecommunication Networks Quiz

The formula is Transmission Time (T) = Packet Size / Link Data Rate.

Frame Relay removes one complete layer of processing such as data checking and acknowledgments compared to X.25.

VCI and VPI are used to route data frames through the network by identifying the frames.

<p>Frame Relay supports data rates ranging from 1.544 Mbps to 44.376 Mbps.</p> Signup and view all the answers

<p>Frame Relay is a connection-oriented protocol, and a virtual circuit must be established before data transfer.</p> Signup and view all the answers

<p>BECN notifies upstream nodes of congestion in the network.</p> Signup and view all the answers

<p>DLCI is used to identify virtual circuits within the Frame Relay network.</p> Signup and view all the answers

<p>Frame Relay uses packet-switching to allow multiple virtual circuits to share the same physical connection.</p> Signup and view all the answers

<p>The three planes are the user plane, control plane, and management plane.</p> Signup and view all the answers

<p>VPI and VCI are used to uniquely identify a virtual path and a virtual circuit within the ATM network.</p> Signup and view all the answers

<p>Advantages include simplified network architecture, increased performance and reliability, and reduced connection setup time.</p> Signup and view all the answers

<p>An ATM cell is 53 bytes long, consisting of a 5-byte header and a 48-byte payload.</p> Signup and view all the answers

<p>The GFC field controls data flow between the first ATM switch and the user node.</p> Signup and view all the answers

<p>Fixed-size cells can reduce queuing delays for high-priority cells, allowing them to be processed faster.</p> Signup and view all the answers

<p>The UNI header includes the GFC field, while the NNI header includes a Virtual Path Identifier (VPI) instead of GFC.</p> Signup and view all the answers

<p>Fixed-size cells simplify the switching mechanism, allowing for efficient processing at very high data rates.</p> Signup and view all the answers

<p>Banks, securities firms, large enterprises, and government departments can benefit from Frame Relay technology.</p> Signup and view all the answers

<p>Transmission time is calculated using the formula: $T = \frac{F}{R}$, where $F$ is frame size and $R$ is link data rate.</p> Signup and view all the answers

<p>ATM was developed to overcome the delays caused by variable-sized packets in traditional packet-switched networks.</p> Signup and view all the answers

<p>An ATM cell is 53 bytes in size, consisting of a 5-byte header and a 48-byte payload.</p> Signup and view all the answers

<p>Virtual channels (VCs) in ATM networks provide a connection between source and destination for cell transmission.</p> Signup and view all the answers

<p>ATM cell relay provides variable-bit-rate (VBR) service for data and constant-bit-rate (CBR) service for voice and video.</p> Signup and view all the answers

<p>Frame Relay does not support constant-bit-rate (CBR) service, while ATM offers both CBR and variable-bit-rate (VBR) services.</p> Signup and view all the answers

<p>X.25 is an ITU-T standard protocol suite for packet-switched data communication in wide area networks (WAN). It is primarily used in low-quality application networks.</p> Signup and view all the answers

<p>ATM uses time division multiplexing (TDM) to efficiently encode data into fixed-size cells for transmission.</p> Signup and view all the answers

<p>The logical channel number (LCN) identifies the virtual circuit in X.25 networks, facilitating the organization of data transmissions.</p> Signup and view all the answers

<p>LAPB is responsible for higher-layer protocol checking in X.25, ensuring reliable data transmission over the network.</p> Signup and view all the answers

<p>The transmission capacity for a DTE in an X.25 network typically ranges from 75 Kbps to 192 Kbps, up to 2 Mbps.</p> Signup and view all the answers

<p>Common applications of X.25 technology include automated teller machine (ATM) networks and credit card verification networks.</p> Signup and view all the answers

<p>X.25 is considered safe and secure due to its multiple layer processing and data integrity checks across various protocol layers.</p> Signup and view all the answers

<p>The main drawbacks of using X.25 include its low data rate compared to other WAN technologies and the lack of guaranteed quality of service.</p> Signup and view all the answers

<p>The transmission time is approximately 131 seconds.</p> Signup and view all the answers

<p>The payload type specifies whether the cell contains user information or network operational information.</p> Signup and view all the answers

<p>It defines the priority of cells in queues and determines which cells are discarded first during overload.</p> Signup and view all the answers

<p>HEC is a checksum for the first 4 bytes that detects multiple errors and corrects a single error in the cell.</p> Signup and view all the answers

<p>Class A service provides constant-bit-rate (CBR) support, primarily for voice and video applications.</p> Signup and view all the answers

<p>AAL1 supports constant-bit-rate traffic for voice and video and has no requirements for error detection or recovery.</p> Signup and view all the answers

<p>AAL2 accommodates variable-bit-rate traffic requiring timing maintenance, with timing info transmitted in the header.</p> Signup and view all the answers

<p>AAL3/4 provides both connection-oriented service of class C and connectionless service of class D but is overly complex.</p> Signup and view all the answers

<p>Maintenance cells are used by the network to perform operations like error correction, particularly during congestion scenarios.</p> Signup and view all the answers

<p>AAL5 supports variable-bit-rate traffic without timing relationships, and it has minimal overhead due to the lack of enhanced services.</p> Signup and view all the answers

<p>Class D/AAL3/4 is significant as it supports variable-bit-rate traffic without requiring connection establishment, making it suitable for datagram transmission.</p> Signup and view all the answers

<p>ATM technology was once expected to be a major backbone for telecommunications but is declining in importance as LAN and IP switching technology evolve to handle higher data rates.</p> Signup and view all the answers

<p>ADSL is specified to transmit ATM cells, indicating that ATM technology serves as the foundation for certain access technologies.</p> Signup and view all the answers

<p>The transmission time is approximately 2.74 milliseconds.</p> Signup and view all the answers

<p>Total Delay is calculated using the formula: Total Delay = Transmission time + Propagation time.</p> Signup and view all the answers

<p>Transmission Time (T) is defined as T = Cell Size (C) / Link Data Rate (R).</p> Signup and view all the answers

<p>Parameters needed include Cell Size (C), Link Data Rates (R), Distance, and Propagation Speed.</p> Signup and view all the answers