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NEW QUESTION: 1
Which of the following commands creates a function in Bash that outputs the sum of two numbers?
A. function sumitup { echo $(($1 + $2)) ; }
B. command sumitup { echo $(($1 + $2)) ; }
C. method sumitup { echo $1 + $2 ; }
D. command sumitup { echo $1 + $2 ; }
E. function sumitup { echo $1 + $2 ; }
Answer: A
Explanation:
Explanation
Section: Shells, Scripting and Data Management
NEW QUESTION: 2
次のうちどれがCisco FirePOWERアプリケーションレイヤプリプロセッサですか？ （2を選択）
A. ICMPプリプロセッサ
B. SIPプリプロセッサ
C. HTTPプリプロセッサ
D. Modbus
Answer: B,C
Explanation:
- The SIP Preprocessor
The Session Initiation Protocol (SIP) provides call setup, modification, and teardown of one or more sessions for one or more users of client applications such as Internet telephony, multimedia conferencing, instant messaging, online gaming, and file transfer. A methodfield in each SIP request identifies the purpose of the request, and a Request-URI specifies where to send the request. A status code in each SIP response indicates the outcome of the requested action.
After calls are set up using SIP, the Real-time Transport Protocol (RTP) is responsible for subsequent audio and video communication; this part of the session is sometimes referred to as the call channel, the data channel, or the audio/video data channel. RTP uses the Session Description Protocol (SDP) within the SIP message body for data-channel parameter negotiation, session announcement, and session invitation.
- The HTTP Inspect Preprocessor
The HTTP Inspect preprocessor is responsible for:
decoding and normalizing HTTP requests sent to and HTTP responses received from web servers on your network separating messages sent to web servers into URI, non-cookie header, cookie header, method, and message body components to improve performance of HTTPrelated intrusion rules separating messages received from web servers into status code, status message, non-set-cookie header, cookie header, and response body components to improve performance of HTTP-related intrusion rules detecting possible URI-encoding attacks making the normalized data available for additional rule processing Link: https://www.cisco.com/c/en/us/td/docs/security/firepower/60/configuration/guide/fpmc-HYPERLINK "https://www.cisco.com/c/en/us/td/docs/security/firepower/60/configuration/guide/fpmc-config-guide-v60/Application_Layer_Preprocessors.html#ID-2244-0000080c"config-guide-v60/Application_Layer_Preprocessors.html#ID-2244-0000080c
NEW QUESTION: 3
Which of the following is NOT true of the Kerberos protocol?
A. The initial authentication steps are done using public key algorithm.
B. It performs mutual authentication
C. The KDC is aware of all systems in the network and is trusted by all of them
D. Only a single login is required per session.
Answer: A
Explanation:
Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography. It has the following characteristics:
It is secure: it never sends a password unless it is encrypted.
Only a single login is required per session. Credentials defined at login are then passed between resources without the need for additional logins.
The concept depends on a trusted third party - a Key Distribution Center (KDC). The KDC is aware of all systems in the network and is trusted by all of them.
It performs mutual authentication, where a client proves its identity to a server and a server proves its identity to the client.
Kerberos introduces the concept of a Ticket-Granting Server/Service (TGS). A client that wishes to use a service has to receive a ticket from the TGS - a ticket is a time-limited cryptographic message - giving it access to the server. Kerberos also requires an Authentication Server (AS) to verify clients. The two servers combined make up a KDC.
Within the Windows environment, Active Directory performs the functions of the KDC. The following figure shows the sequence of events required for a client to gain access to a service using Kerberos authentication. Each step is shown with the Kerberos message associated with it, as defined in RFC 4120 "The Kerberos Network Authorization Service (V5)".
Kerberos Authentication Step by Step
Step 1: The user logs on to the workstation and requests service on the host. The workstation sends a message to the Authorization Server requesting a ticket granting ticket (TGT).
Step 2: The Authorization Server verifies the user's access rights in the user database and creates a TGT and session key. The Authorization Sever encrypts the results using a key derived from the user's password and sends a message back to the user workstation.
The workstation prompts the user for a password and uses the password to decrypt the incoming message. When decryption succeeds, the user will be able to use the TGT to request a service ticket.
Step 3: When the user wants access to a service, the workstation client application sends a request to the Ticket Granting Service containing the client name, realm name and a timestamp. The user proves his identity by sending an authenticator encrypted with the session key received in Step 2
Step 4: The TGS decrypts the ticket and authenticator, verifies the request, and creates a ticket
for the requested server. The ticket contains the client name and optionally the client IP address. It also contains the realm name and ticket lifespan. The TGS returns the ticket to the user workstation. The returned message contains two copies of a server session key - one encrypted with the client password, and one encrypted by the service password.
Step 5: The client application now sends a service request to the server containing the ticket received in Step 4 and an authenticator. The service authenticates the request by decrypting the session key. The server verifies that the ticket and authenticator match, and then grants access to the service. This step as described does not include the authorization performed by the Intel AMT device, as described later.
Step 6: If mutual authentication is required, then the server will reply with a server authentication message.
The Kerberos server knows "secrets" (encrypted passwords) for all clients and servers under its
control, or it is in contact with other secure servers that have this information. These "secrets" are
used to encrypt all of the messages shown in the figure above.
To prevent "replay attacks," Kerberos uses timestamps as part of its protocol definition. For
timestamps to work properly, the clocks of the client and the server need to be in synch as much
as possible. In other words, both computers need to be set to the same time and date. Since the
clocks of two computers are often out of synch, administrators can establish a policy to establish
the maximum acceptable difference to Kerberos between a client's clock and server's clock. If the
difference between a client's clock and the server's clock is less than the maximum time difference
specified in this policy, any timestamp used in a session between the two computers will be
considered authentic. The maximum difference is usually set to five minutes.
Note that if a client application wishes to use a service that is "Kerberized" (the service is
configured to perform Kerberos authentication), the client must also be Kerberized so that it
expects to support the necessary message responses.
For more information about Kerberos, see http://web.mit.edu/kerberos/www/.
References:
Introduction to Kerberos Authentication from Intel
and
http://www.zeroshell.net/eng/kerberos/Kerberos-definitions/#1353
and
http://www.ietf.org/rfc/rfc4120txt
NEW QUESTION: 4
In a graphical calculation view you specify the default client to be dynamic.
How is the client value determined when the view is used?
A. By checking the session client of the user accessing the view
B. By reading the client of the tables in the view
C. By executing a procedure in the user's own schema
D. By applying the filtering conditions on the client field
Answer: A
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