Computer Networks — Test 20

Correct Answer: C. C. @matrixparam
Explanation: @MatrixParam is the annotation that binds the parameter passed to method to a HTTP matrix parameter in path, while @QueryParam binds to a query parameter, @PathParam binds to a value and @HeaderParam binds to the HTTP header in the path.

Correct Answer: B. B. True view
Explanation: In REST architecture, a REST Server simply provides access to resources and REST client accesses and presents the resources. It is popularly used because it makes efficient use of the bandwidth and can be cached for better performance and scalability.

Correct Answer: B. B. False
Explanation: POST operation can cause different result so they are not idempotent. The DELETE and PUT operations are idempotent as they invoke the same result every time they are called.

Correct Answer: A. A. Wireless transport security layer
Explanation: WTLS is Wireless Transport Security Layer. It provides security between the mobile device and the WAP gateway to internet.

Correct Answer: A. A. Huge number of systems on the internet
Explanation: Due to huge number of systems on the internet and the lower number of available addresses on IPv4, transition from IPv4 to IPv6 needs to happen. IPv4 provides around 4 billion unique IP addresses whereas IPv6 provides over 340 undecillion unique IP addresses.

Correct Answer: C. C. Conversion
Explanation: As IPv4 addresses are of 32 bits and IPv6 addresses are of 128 bits, it is not possible to convert IPv4 address to IPv6 address. So, Dual stack, tunneling and header translation are the three strategies which might help in the transition from IPv4 to IPv6.

Correct Answer: B. B. Domain name server
Explanation: Source host queries DNS to determine which version to use when sending a packet to a destination. The DNS contains both, the IPv4 and IPv6 addresses of the modern dual stack host servers.

Correct Answer: D. D. Tunneling
Explanation: In tunneling, The IPv4 routers can form a tunnel in which at the sender’s side, the IPv6 datagram is encapsulated in to IPv4, and at the receiver’s side of the tunnel, the IPv4 packet is stripped and the IPv6 packet is sent to the receiver.

Correct Answer: A. A. Iii-i-ii
Explanation: At the sender’s side, the IPv6 datagram is encapsulated in to IPv4 i.e. An IPv4 header is inserted on top of the IPv6 header, and then the packet is sent through the tunnel.

Correct Answer: B. B. Header translation
Explanation: Header translation is used when the sender wants to use IPv6, but the receiver does not understand IPv6. It is made possible through a Network Address Translation – Protocol Translation enabled device such as a gateway.