CS509

Network layer protocols is implemented in every host and router. true. false.

In router, the switching via bus causes two bus crossings per datagram. true. false.

The IMAP is used only to pull emails from mail servers. true. false.

In persistent HTTP, at most, one object is sent over a TCP connection and then the connection is closed, so downloading multiple objects require multiple connections. true. false.

Link frame is created by appending the link layer header to transport segment. true. false.

DNS iterative query puts heavy load at the upper levels of DNS servers hierarchy. true. false.

TCP applies ___ approach to control congestion and reduce segments loss. MIAD. AIMD. MDAI. ADMI.

Human communication needs ___-way handshake procedure to establish a connection. five. four. three. two.

TCP segment retransmission is triggered by the occurrence of at least one of ___ actions. five. four. three. two.

. A protocol must define ___ aspects for communication. five. four. three. two.

Types of DNS resource record are ___. (A)five. (B) four. (C) three. (D) two.

Presenting an address to ___ memory in router retrieves the stored address with longest prefix matching in one clock cycle, regardless of forward table size. TCAM. SCAM. DCAM. RCAM.

Link frame is created by appending the link layer header to transport segment. true. false.

Human communication needs ___-way handshake procedure to establish a connection. five. four. three. two.

The forward table of router is stored in the memory of its input port. true. false.

DNS iterative query puts heavy load at the upper levels of DNS servers hierarchy. true. false.

In tunneling, IPv6 datagram is carried as payload in IPv4 datagram among IPv4 routers. true. false.

HTTP protocol is stateless. True. False.

In persistent HTTP, at most, one object is sent over a TCP connection and then the connection is closed, so downloading multiple objects require multiple connections. True. False.

Switching datagrams from input port(s) to output port(s) inside router is performed in decentralized form without interruptions of router processor. True. False.

In router, the switching via memory causes ___ bus crossings per datagram. two. three. four. five.

UDP checksum treats segment contents as sequence of ___-byte integers. (A)2. (B) 4. (C) 6. (D) 16.

In HTTP, the ___ method sends user inputs in the URL field of the message request line. POST. HEAD. GET. PUT.

The occurrence of at least one of ___ actions triggers TCP segment retransmission. two. three. four. five.

In communication model, the ___ means the host that generates data to be transmitted. source. destination. transmitter. receiver.

services are provided by DNS server to hosts. Two. Three. Four. Five.

To schedule frames and mitigate HOL blocking, ___ divides objects to be sent into frames. (A)HTTP 3.0. (B) HTTP 2.0. (C) HTTP 1.1. (D) HTTP 1.0.

HTTP 1.1 provides ___ method types in the request line of its request message. two. three. four. five.

Cryptography is the best defense against ___ attack. (A)IP spoofing. (B) denial of service. (C) DNS tunneling. (D) packet sniffing.

At the DSLAM , the analog signals from many such houses are translated back into digital format. True. Flase.

.............. also referred to as access or branch routers, are specialized routers that act as gateways at the network edge. Edge routers. Network core. Network edge. All of the above.

A protocol must define ___ aspects for communication. one. two. tree. four.

Types of DNS resource record are ___. one. two. tree. four.

In the context of a communication session between a pair of processes, the process that initiates the communication (that is, initially contacts the other process at the beginning of the session) is labeled as the ................. . The process that waits to be contacted to begin the session is the .......................... a. Client, Web server. b. Client, router. c. Web server, client. d. Router, host.

In HTTP persistent connections. a. Multiple Web pages residing on the same server can be sent from the server to the same client over a single persistent TCP connection. b. all of the requests and their corresponding responses between the client and the server are sent over the same TCP connection. c. Server leaves the TCP connection open after sending a response and subsequent requests and responses between the same client and server can be sent over the same connection. d. The HTTP server closes a connection when it isn’t used for a certain time. e. All the above.

If the client needs to fetch HTML page including 10 images and one video with HTTP nonpersistent connection, how many TCP connections the clients will request: 1. 10. 12. 11.

The amount of time that elapses from when a client requests the base HTML file until the entire file is received by the client, is called........... a. Round trip time (RTT). b. Response time. c. Transmission time. d. None of the above.

The disadvantages of HTTP persistent connection includes: a. A new connection must be established and maintained for each requested object. b. Each object suffers a delivery delay of two RTTs. c. Both a and b. d. None of the above.

............................ is the first line of an HTTP request message. a. Request line. b. Header line. c. Both a and b. None.

The following are the fields of the request line of the HTTP request message ................... a. The method field. b. The URL field. c. HTTP version field. d. All of the above.

n the HTTP request message, the header line includes ................... a. The header line Host. b. Connection: close. c. User-agent. d. Accept-language. e. All of the above.

With POST message, the entity body of the HTTP request message is empty. True. False.

The data entered by the user in the web form is stored in the entity body of the HTTP request message with the .................. a. POST message. b. GET message. c. HEAD message. d. PUT message.

The data entered by the user in the web form is stored in the URL field of the HTTP request message with the .................. a. POST message. b. GET message. c. HEAD message. d. PUT message.

The server responds with an HTTP message but it leaves out the requested object, if the HTTP request method is. a. POST. b. GET. c. HEAD. d. PUT.

In the HTTP response message, the .............................. is the status code that means that Requested object has been permanently moved. 200. 301. 404. 505.

n the HTTP response message, the .............................. is the status code that means that the request could not be understood by the server. 200. 301. 400 Bad request. 505.

In the HTTP response message, the .............................. is the status code that means that The requested HTTP protocol version is not supported by the server. 200. 301. 404. 505.

............................... is a network entity that satisfies HTTP requests on the behalf of an origin Web server. a. Web cache. b. Proxy cache. c. Both a and b. d. None of the above.

............................. provide the IP addresses of the TLD servers. a. Root name servers. b. TLD. c. Authoritative DNS servers. d. None of the above.

............................. provide the IP addresses for authoritative DNS servers. a. Root name servers. b. TLD (top-level-domain servers). c. Authoritative DNS servers. d. None of the above.

In ..........................., server must send a copy of the file to each of the peers. a. Client-server file distribution. b. P2P file distribution. c. Both a and b. d. None of the above.

................................ protocol provides logical communication between application processes. a. Application layer. b. Transport layer. c. Network layer. d. Data-link layer.

................................ provides a process-to-process communication. a. Application layer. b. Transport layer. c. Network layer. d. Data-link layer.

............................... provides a host-to-host communication. a. Application layer. b. Transport layer. c. Network layer. d. Data-link layer.

Extend host-to-host delivery service provided by the network layer to a process-to-process delivery service for applications running on the hosts is called. Multiplexing. Demultiplexing. Multiplexing and demultiplexing. None of the above.

At the receiving host, the transport layer receives messages from the network layer and sends them to the appropriate application layer processes. Multiplexing. Demultiplexing. Multiplexing and demultiplexing. None of the above.

Transport layer multiplexing/demultiplexing requires: a. sockets have unique identifiers. b. each segment have special fields that indicate the socket to which the segment is to be delivered (source port number and destination port number). c. both a and b. d. none of the above.

This job of delivering the data in a transport-layer segment to the correct socket is called ..................... Multiplexing. Multiplexing and demultiplexing. Demultiplexing. None of the above.

UDP guarantee of the quality of the serve: True. false.

in the TCP connection, If the destination is not found, then the sender will be notified: True. false.

The IP protocol provides unreliable connection but with the TCP protocol it provides reliable connection .......... True. false.

n the ............................., the sender is allowed to transmit multiple packets (when available) without waiting for an acknowledgment but is constrained to have no more than some maximum allowable number, N, of unacknowledged packets in the pipeline. a. stop-and-wait protocol. b. Go-back-N protocol. c. Selective repeat. d. Both b and c.

The Network Layer provides: a. Host-to-host communication. b. Process-to-process communication. c. Both a and b. d. None of the above.

............... is per-router functions that determine how a datagram (a network layer packet) arriving on one of a router’s input links is forwarded to one of that router’s output links. a. Data plane. b. Forwarding. c. Both a and b. d. None of the above.

........................ is one function implemented in the data plane. a-Routing. b-Forwarding. c-Both a and b. d-None of the above.

............. is the function in which the network layer must determine the route or path taken by packets as they flow from a sender to a receiver. a-Routing. b-Forwarding. c-Both a and b. d-None of the above.

................ is implemented in the control plane of the network layer. a-Routing. b-Forwarding. c-Both a and b. d-None of the above.

.............................. is responsible for creating the forwarding table. a-Control plane. b-Data plane. c-Both a and b. d-None of the above.

Traditionally, .............................. determines the contents of the routers’ forwarding tables, in the control plane. Routing algorithms. Forwarding algorithms. SDN (software-defined networking). None of the above.

In ....................... approach, the routing algorithms determines the contents of the routers’ forwarding tables. a. SDN. b. Traditional. c. Both a and b. d. None of the above.

........................... is a network service that guarantees that a packet sent by a source host will eventually arrive at the destination host. a. Guaranteed delivery. b. Guaranteed delivery with bounded delay. c. In-order packet delivery. d. Guaranteed minimal bandwidth.

The Internet’s network layer provides a single service, known as.............................. a. best-effort service. b. DSL service. c. Both a and b. d. None of the above.

.............................. connects the router’s input ports to its output ports. a. Switching fabric. b. Input link. c. Output link. d. Routing processor.

............................. stores packets received from the switching fabric and transmits these packets on the outgoing link by performing the necessary link-layer and physical-layer functions. a. Switching fabric. b. Input link. c. Output link. d. Routing processor.

In the switching via ............... , An input port with an arriving packet first signaled the routing processor via an interrupt. a. Memory. b. Bus. c. Crossbar. d. None of the above.

In the switching via ............... , the lookup function is performed by input link. Memory. Bus. Crossbar. None of the above.

........................... in which if the output link is processing a lowest priority packet and a highest priority one arrives, then the processing of the lowest priority stopped to process the highest priority packet first. a. FIFO. b. Preemptive priority queuing. c. None-Preemptive priority queuing. d. Round Robin and Weighted Fair Queuing (WFQ).