CCNA系列认证
单选题Which command encrypts all plaintext passwords?（）A Router(config)#password-encryptionB Router(config)#service password-encryptionC Router#service password-encryptionD Router# password-encryption
题目
Router(config)#password-encryption
Router(config)#service password-encryption
Router#service password-encryption
Router# password-encryption
相似问题和答案
第1题：
What is the effect of using the service password-encryption command?（）
- A、Only passwords configured after the command has been entered will beencrypted.
- B、Only the enable password will be encrypted.
- C、Only the enable secret password will beencrypted
- D、It will encrypt the secret password and remove the enable secret password from the configuration.
- E、It will encrypt all current and future passwords.
正确答案:E
第2题：
ou executed the command to create a password file in the database server： $ orapwd file=orapworcl entries=5 ignorecase=N Which statement describes the purpose of the above password file（）
- A、It records usernames and passwords of users when granted the DBA role.
- B、It contains usernames and passwords of users for whom auditing is enabled.
- C、It is used by Oracle to authenticate users for remote database administration.
- D、It records usernames and passwords of all users when they are added to OSDBA or OSOPER operating system groups.
正确答案:C
第3题：
You Execute the Following command to create a password file in the database server:$ orapwd file = ‘+DATA/PROD/orapwprod entries = 5 ignorecase = N format = 12’Which two statements are true about the password file?（）
A. It records the usernames and passwords of users when granted the DBA role.
B. It contains the usernames and passwords of users for whom auditing is enabled.
C. Is used by Oracle to authenticate users for remote database administration.
D. It records the usernames and passwords of all users when they are added to the OSDBA or OSOPER operating system groups.
E. It supports the SYSBACKUP, SYSDG, and SYSKM system privileges.
第4题：
How does using the service password encryption command on a router provide additional security?（）
- A、by encrypting all passwords passing through the router
- B、by encrypting passwords in the plain text configuration file
- C、by requiring entry of encrypted passwords for access to the device
- D、by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
- E、by automatically suggesting encrypted passwords for use in configuring the router
正确答案:B
第5题：
Which two statements about using the CHAP authentication mechanism in a PPP link are true?（）
- A、CHAP uses a two-way handshake
- B、CHAP authentication periodically occurs after link establishment
- C、CHAP has no protection from playback attacks
- D、CHAP authentication is performed only upon link establishment
- E、CHAP uses a three-way handshake
- F、CHAP authentication passwords are sent in plaintext
正确答案:B,E
第6题：
What is the effect of using the service password-encryption command?（）
- A、only passwords configured after the command has been entered will be encrypted
- B、Only the enable password will be encrypted
- C、Only the enable secret password will be encrypted
- D、It will encrypt the secret password and remove the enable secret password from the configuration
- E、It will encrypt all current and future passwords.
正确答案:E
第7题：
Which of the following are TACACS+ characteristics？（Choose all that apply.）（）
- A、Cisco proprietary
- B、Standards-based protocol
- C、Provides separate services for authentication， authorization， and accounting
- D、Encrypts only the password
- E、Uses UDP for a transport layer
- F、Encrypts the entire packet
正确答案:A,C,F
第8题：
A.Router(config)#password-encryption
B.Router(config)#service password-encryption
C.Router#service password-encryption
D.Router# password-encryption
第9题：
Which command encrypts all plaintext passwords?（）
- A、Router(config)#password-encryption
- B、Router(config)#service password-encryption
- C、Router#service password-encryption
- D、Router# password-encryption
正确答案:B
第10题：
Which of the following is true about Kerberos?以下哪一个是关于Kerberos的描述是正确的？（）
- A、It encrypts data after a tickt is granted，but passwords are exchanged in plaintext.它在ticket获得授权后对数据进行加密，但是密码的交换是明文方式。
- B、It depends upon symmetric ciphers.它依赖于对称加密。
- C、It is a second party authentication system.它是一种第二方的认证系统
- D、It utilizes public key cryptography.它使用公钥密码学。
正确答案:B