ENC3250 Solutions pg 57

ENC3250 Solutions pg 57 - cards and decks: WML includes...

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Unformatted text preview: cards and decks: WML includes provisions for event handling, which is used for navigation or executing scripts. 12.10 Class 0 provides an unreliable datagram service, which can be used for an unreliable push operation. Class 1 provides a reliable datagram service, which can be used for a reliable push operation. Class 2 provides a request/response transaction service and supports the execution of multiple transactions during one WSP session. 12.11 Data integrity: Ensures that data sent between the client and the gateway are not modified, using message authentication. Privacy: Uses encryption to ensure that a third party cannot read the data. Authentication: Establishes the authentication of the two parties, using digital certificates. Denial-of-service protection: Detects and rejects messages that are replayed or not successfully verified. A N SWERS NSWERS TO PROBLEMS 12.1 a. MAC-H DA = MACDA(E-Z) LLC-H DSAP = DSAP (E) IP-H DA = IPDA(HA-E) TCP-H Data IP-H DA = IPDA(HA-E) TCP-H Data b. MAC frame leaving D: MAC-H DA = MACDA(R3-Z) LLC-H DSAP = DSAP (R3) IP datagram leaving R3 (using header formats of Figure 12.7a): IP-H DA = IPDA(CA-E) IP-H DA = IPDA(HA-E) TCP-H Data c. IP datagram leaving R3 (using header formats of Figure 12.7b): IP-H DA = IPDA(CA-E) IP-H DA = IPDA(HA-E) TCP-H Data Legend: MAC-H = MAC header; LLC-H = LLC header; IP-H = IP header; TCP-H = TCP header; MACDA(E-Z) = MAC destination address of E on LAN Z; DSAP(E) = LLC DSAP for E; IPDA(HA-E) = E's home IP address; IPDA(CA-E) = E's care-of IP address. -57- ...
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This note was uploaded on 02/20/2012 for the course ENC 3250 taught by Professor Dr.timothycerner during the Fall '11 term at UNF.

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