Quiz 1

Suppose two osts, A and B, are separated by 5,000 kilometers and are connected by a direct link of R = 1Mbps. Suppose the propagation sped over the link is 2.5x10^5 km/s. What is the Max number of bits that will be in the link at any time? (A) 20000 (B) 40000 (C) 10000 (D) 80000

(A) 20000

Which of the follwing is NOT true of client server architecture? (A) Clients communicate directly with each other (B) Client initiates the contact with the server (C) Client may be intermittently connected (D) Client may have dynamic IP-Address

(A) Clients communicate directly with each other

Which of the flowing is not a service provided by DNS? (A) Dynamic IP address allocation (B) Host-name to IP address translation (C) Mail server aliasing (D) Host aliasing

(A) Dynamic IP address allocation

Which of the following is not an end system? (A) Router (B) Laptop (C) Server (D) Smartphone

(A) Router

Process to process data transfer is the responsibility of (A) Transport layer (B) Network layer (C) Link layer (D) Application layer

(A) Transport layer

Getting a web page with 6 images with persistent HTTP without pipe-lining takes (A) 14 R.T. (B) 7 R.T. (C) 12 R.T. (D) 10 R.T.

(B) 7 R.T.

With non-persistent HTTP... (A) Multiple objects can be sent over a TCP connection (B) At most one object is sent over a TCP connection

(B) At most one object is sent over a TCP connection

Creating a network application implies writing programs that run on the network core devices. (A) True (B) False

(B) False

Which of the following is NOT a reason to choose TCP for file transfer? (A) File transfer requires reliable delivery (B) File transfer needs to be secure (C) File transfer is an elastic application (D) File transfer is time sensitive

(B) File transfer needs to be secure

Moving packets from router input to appropriate router output interface is called... (A) Routing (B) Forwarding

(B) Forwarding

What information is used by a process to identify a process running on another host? (A) Host Ethernet address and Process Id (B) Hot IP Address and Socket Port (C) Host Ethernet Address and Socket Port Number (D) Host IP Address and Process ID

(B) Host IP Address and Port Number

Which of the following is NOT a part of Uniform Resource Locator (URL)? (A) Server host name and port number (B) Object size (C) Application protocol (D) Object path name

(B) Object size

Which of the following delays vary depending on the network congestion? (A)Propagation delay (B) Queuing delay (C) Transmission delay (D) Nodal processing delay

(B) Queuing delay

Which is NOT true about packet switching with store-and-forward transmission? (A) Hosts break application layer messages into packets (B) Router begins forwarding as soon as it gets packet's header (C) Packet incurs transmission delay at each hop (D) Each packet is transmitted at full link capacity

(B) Router begins forwarding as soon as it gets packet's header

What is the key benefit of P2P architecture? (A) Faster download (B) Self scalability

(B) Self scalability

How many sockets does a UDP server suporting 10 different clients simultaneously need? (A) 11 (B) 20 (C) 1 (D) 10

(C) 1

How many sockets does a TCP server supporting 10 different clients simultaneously need? (A) 20 (B) 1 (C) 11 (D) 10

(C) 11

Which type of DNS resource record contains the IP Address of a hostname? (A) MX (B) CNAME (C) A (D) NS

(C) A

Which of the following services are provided by both TCP and UDP? (A) Congestion control (B) Reliable transport (C) Inter-process communication (D) Flow contorl

(C) Inter-process communication

Data transfer between neighboring network elements is the responsibility of (A) Network layer (B) Transport layer (C) Link layer (D) Application layer

(C) Link Layer

Which layers in the Internet protocol stack does a router process? (A) Physical, Link, Network, Transport, Application (B) Physical, Link, Network, Transport (C) Physical, Link, Network (D) Physical, Link

(C) Physical, Link, Network

Web caching wit ha hit ration of 20% reduces the delay for... (A) 80% of objects requested by user (B) 20% of objects requested by user (C) 40% of objects requested by user (D) 100% of objects requested by user

(D) 100% of objects requested by user

Getting a web page with 6 images with non-persistent HTTP with no parallel TCP connections takes... (A) 8 round trips (B) 12 round trips (C) 7 round trips (D) 14 round trips

(D) 14 round trips

Which of the following is NOT a networking application? (A) YouTube (B) WhatsApp (C) BitTorrent (D) Notepad

(D) Notepad

Whcih of the following is NOT needed for maintaining state using cookies? (A) Cookie file kept on user's host (B) Cookie specific action by server with back-end database (C) Cookie header line in HTTP request messages (D) Persistent HTTP where server keeps connection open

(D) Persistent HTTP where server keeps connection open