单选题With PGP， which of the following entity signs a users’s public key？（）AThe sender of the message.BThe receipient of the message.CThe sender’s administrator who provides the sender with the PGP program.DA third party that belongs to what’s often known as

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单选题

With PGP， which of the following entity signs a users’s public key？（）

The sender of the message.

The receipient of the message.

The sender’s administrator who provides the sender with the PGP program.

A third party that belongs to what’s often known as web of trust， that can verify the relationship between the user and the key.

The vendor of the PGP program.

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相似问题和答案

第1题：

Which of the following means "收信人"?

A: Recipient

B: Buyer

C: Consumer

D: Sender

正确答案: A

第2题：

Symmetric, or private-key, encryption is based on a secret key that is shared by both communcating parties. The （） party uses the secret key as part of the mathematical operation to encrypt （） text to cipher text. The receiving party uses the same secret key to decrypt the cipher text to plain text. Asymmetric, or public-key, encryption uses two different keys for each user: one is a （） key known only to this one user; the other is a corresponding public key, which is accessible to anyone. The private and public keys are mathematically related by the encryption algorithm. One key ia used for encyption and the other for decryption, depending on the nature of the communication service being implemented. In addition, public key encryption technoligies allow digital （_______） to be placed on messages. A digital signature uses the sender's private key to encrypt some portion of the message. When the message is received, the receiver uses the sender's （） key tp decipher the digital signature to verify the sender's identity.横线处应选（）。

A. interpretation
B.signatures
C. encryption
D.decryption

答案：B

解析：

对称加密或私钥加密的基础是通信双方共享同一密钥。发送方使用一个密钥作为数学运算的一部分把明文加密成密文。接收方使用同一密钥把密文解密变成明文。在非对称或公钥加密方法中，每个用户使用两种不同的密钥:一个是只有这个用户知道的私钥;另一个是与其对应的任何人都知道的公钥。根据加密算法，私钥和公钥是数学上相关的。一个密钥用于加密，而另一个用于解密，依赖于实现的通信服务的特点而用法有所不同。此外，公钥加密技术也可以用于报文的数字签名。数字签名时使用发送方的私钥来加密一部分报文。当接收方收到报文时，就用发送方的公钥来解密数字签名，以便对发送方的标识进行验证。

第3题：

The person sending a message is NOT influenced by which of the following

A sender's credibility

B receiver's assumptions

C receiver's evaluative and tendency

D receiver's attitude and needs

E sender's knowledge

正确答案：C

第4题：

With PGP， which of the following entity signs a users’s public key？（）

A、 The sender of the message.
B、 The receipient of the message.
C、 The sender’s administrator who provides the sender with the PGP program.
D、 A third party that belongs to what’s often known as "web of trust"， that can verify the relationship between the user and the key.
E、 The vendor of the PGP program.

正确答案:D

第5题：

In Frame Relay， FECN messages indicating congestion are sent or received by which of following？（）

A、Sent by the destination
B、Received by the sender
C、Received by the destination
D、Sent by the sender

正确答案:C

第6题：

Which three components can be leveraged when defining a local whitelist or blacklist for antispam on a branch SRX Series device? (Choose three.)()

A. spam assassin filtering score

B. sender country

C. sender IP address

D. sender domain

E. sender e-mail address

参考答案：C, D, E

第7题：

Which two steps does a receiver perform to validate a message using HMAC？（）

A、 decrypts the received MAC using a secret key
B、 compares the computed MAC vs. the MAC received
C、 authenticate the receivedmessage using the sender’s public key
D、 look up the sender’s public key
E、 extracts the MAC from the receivedmessage thenencrypts the received message with a secret keyto producethe MAC
F、 Computes the MAC using the receivedmessage and a secret key as inputs to the hash function

正确答案:B,F

第8题：

195 The person sending a message is NOT influenced by which of the following

A. sender's credibility

B. receiver's assumptions

C. receiver's evaluative and tendency

D. receiver's attitude and needs

E. sender's knowledge

正确答案：C

第9题：

Which statement is true about a certificate authority？（）

A、An entity responsible for registering the private key encryption used in a PKI
B、An agency responsible for granting and revoking public-private key pairs
C、A trusted third party responsible for signing the public keys of entities in a PKIbased system
D、A trusted third party responsible for signing the private keys of entities in a PKIbased system

正确答案:C

第10题：

The classic Spanning Tree Protocol （802.1D 1998） uses which sequence of variables to determine the best received BPDU？（）

A、lowest root bridge id；lowest sender bridge id；lowest port id；lowest root path cost
B、lowest root path cost；lowest root bridge id；lowest sender bridge id；lowest sender port id
C、lowest root bridge id；lowest sender bridge id；lowest root path cost；lowest sender port id
D、lowest root bridge id；lowest root path cost；lowest sender bridge id；lowest sender port id

正确答案:D

单选题With PGP， which of the following entity signs a users’s public key？（）A The sender of the message.B The receipient of the message.C The sender’s administrator who provides the sender with the PGP program.D A third party that belongs to what’s often

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