Question: Answer the following questions about Figure 2.2 when the communication is from Maria to Ann: a. What is the service provided by layer 1 to

Answer the following questions about Figure 2.2 when the communication is from Maria to Ann:
a. What is the service provided by layer 1 to layer 2 at Maria€™s site?
b. What is the service provided by layer 1 to layer 2 at Ann€™s site?

Figure 2.2

Maria Ann Layer 3 Layer 3 Listen/Talk Listen/Talk Identical objects Plaintext -Plaintext Layer 2 Encrypt/Decrypt Encrypt

Maria Ann Layer 3 Layer 3 Listen/Talk Listen/Talk Identical objects Plaintext -Plaintext Layer 2 Encrypt/Decrypt Encrypt/Decrypt Layer 2 Identical objects |Ciphertext Ciphertext Send mail/ Send mail/ Layer 1 Layer 1 receive mail receive mail Identical objects -Mail Mail US Post US Post Postal carrier facility

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