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R17. What is the difference between a permanent address and a care-of address? Who assigns a care-of address?
Answer: A permanent address is the home address and care of address is the given address of the device such as mobile. Permanent address is where mobile devices live. Care of address is given to the mobile device by the foreign agent when a device entire to another network area. Permanent address will get all the derive data and then the home agent forward data/messages onto the other network via the care of address. After that mobile device directly responds to the correspondent. R1. What are the differences between message confidentiality and message integrity? Can you have confidentiality without integrity? Can you have integrity without confidentiality? Justify your answer.
Answer: Confidentiality is the property that the original plaintext message cannot be determined by an attacker who intercepts the cipher text-encryption of the original plaintext message. Message integrity is the property that the receiver can detect whether the message sent (whether encrypted or not) was altered in transit. The two are thus different concepts, and one can have one without the other. An encrypted message that is altered in transmit may still be confidential but will not have message integrity if the error is undetected. Similarly, a message that is altered in transit (and detected) could have been sent in plaintext and thus would not be confidential
Message confidentiality means that the message being sent is only known by the sender and the recipient. This differs from message integrity, which means that a message is not tampered with and that the sender and recipient are exactly who they say they are. I believe you can have integrity without confidentiality because your message to each other could be public and yet you could authenticate the sender and recipient. R29. Stateful packet filters maintain two data structures, name them and briefly describe what they do.
Answer: The two main data structures are filter tables and connection tables. Filter Table: The filter table works enclosed by a data range or table, it permits two options or either getting a specific data within a range or present all previous data at once. They dictate whether the data gram secluded should be given way in or dropped based on certain rules/protocols. Connection Table: This is the center of the data structure which is used reserve and control the molecular structure in data. The connection tables has current and total connection columns respectively. These columns traces/tracks the present and total number of connections per tracking value. Though, both current and total connections have slight differences depending on what is being used for tracking values.

R3. From a service perspective, what is an important difference between a symmetric-key system and a public-key system?
Answer: One very important difference between these two systems is both the sender and receiver must be aware of what the same (secret) key. In public key systems, the encryption and decryption keys different. The encryption key is well recognized by everybody (including the sender),while the decryption key is well recognized by only the receiver.

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