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質問 1：
Services A, B and C belong to Service Inventory A.
Services D, E and F belong to Service Inventory B.
Service C acts as an authentication broker for Service Inventory A.
Service F acts as an authentication broker for Service Inventory B.
Both of the authentication brokers use Kerberos-based authentication technologies. Upon receiving a request message from a service consumer, Services C and F authenticate the request using a local identity store and then use a separate Ticket Granting Service (not shown) to issue the Kerberos ticket to the service consumer.
Currently, tickets issued in one service inventory are not valid in the other. For example, if Service A wants to communicate with Services D or E, it must request a ticket from the Service Inventory B authentication broker (Service F). Because Service Inventory A and B trust each other, the current cross-inventory authentication is considered unnecessarily redundant.
How can these service inventory architectures be improved to avoid redundant authentication?
A. Create a single, enterprise-wide service inventory by merging Service Inventories A and B.
Instead of the current Kerberos-based brokered authentication, the merged service inventory can use X.509 digital certificates to remove the burden from the local authentication brokers. Designate either Service C or Service F as the central authentication service with the responsibility to validate service consumer X.509 digital certificates. After successful validation, the authentication service can issue a signed SAML token to be used within the entire service inventory.
B. The same Kerberos tickets can be used across both service inventories by updating the security policies of the services that require Kerberos tickets. Because each authentication broker issues Kerberos tickets, the only difference between these tickets is the identity of the issuer. For example, because services in Service Inventory A already accept Kerberos tickets issued by Service C, Service F just needs to be included in the security policies of these services. Similarly, services in Service Inventory B that accept Kerberos tickets issued by Service F need to include the acceptance of Kerberos tickets issued by Service C in their security policies.
C. Replace Services C and F with a single authentication broker so that one single token can be used with services across both service inventories. This can be achieved by merging the content of the two identity stores.
D. A trust relationship needs to be established between the two authentication brokers.
This trust relationship can enable the authentication brokers to accept Kerberos tickets issued by each other.
正解：D
質問 2：
A. Apply the Trusted Subsystem pattern together with the Data Origin Authentication pattern in order to establish a utility service that performs the security processing on behalf of Service A.
Service Consumer A must digitally sign all request messages and encrypt the credential information using the public key of the utility service. The utility service can then verify the security credentials and the digital signature to establish the validity of the request message. If the request message is permitted, the utility service establishes a composite trust domain that encompasses Service Consumer A, Service A, Database A, and the legacy system. Because all communications remain within a single trust domain, malicious intermediaries will not be able to gain access to any exchanged data.
B. Apply the Service Perimeter Guard pattern together with the Trusted Subsystem pattern to establish a perimeter service that can perform security functions on behalf of Service A.
The utility service can verify the validity of the request messages from Service Consumer A by authenticating the request message against an identity store. If the request message is authenticated, the utility service then sends it to Service A for further processing. All communications between Service A and Service Consumer A can be encrypted using the public key of the intended recipient, and signed using the private key of the sender.
Industry standards that can be used for this solution are XML-Encryption, XML-Signature, and WS-Trust.
C. Apply the Data Origin Authentication pattern together with the Data Confidentiality pattern in order to establish message-layer security that guarantees the confidentiality and integrity of messages exchanged by Service Consumer A and Service A.
Further, a security policy can be created to require that security credentials submitted to Service A must be digitally signed and encrypted and also contain a timestamp to validate the actual time the request was issued. Industry standards that can be used for this solution are WS- Policy, WS-SecurityPolicy, XML-Encryption, and XML-Signature.
D.
E. Apply the Service Perimeter Guard pattern to establish a perimeter service that can perform security functions on behalf of Service A.
Next, apply the Data Confidentiality pattern so that the security credential information provided by Service Consumer A with the request message is encrypted with the secret key shared between the perimeter service and Service Consumer A.
The perimeter service evaluates the credentials and if successfully authenticated, forwards the request message to Service A.
Transport-layer security is used to protect message exchanges between Service A and Service Consumer
正解：C,D
質問 3：
Service Consumer A sends a request message to Service A (1), after which Service A sends a request message with security credentials to Service B (2). Service B authenticates the request and, if the authentication is successful, writes data from the request message into Database B (3). Service B then sends a request message to Service C (4), which is not required to issue a response message. Service B then sends a response message back to Service A (5). After processing Service B's response, Service A sends another request message with security credentials to Service B (6). After successfully authenticating this second request message from Service A, Service B sends a request message to Service D (7). Service D is also not required to issue a response message. Finally, Service B sends a response message to Service A (8), after which Service A records the response message contents in Database A (9) before sending its own response message to Service Consumer A (10).
To use Service A, Service Consumer A is charged a per usage fee. The owner of Service Consumer A has filed a complaint with the owner of Service A, stating that the bills that have been issued are for more usage of Service A than Service Consumer A actually used.
Additionally, it has been discovered that malicious intermediaries are intercepting and modifying messages being sent from Service B to Services C and D.
Because Services C and D do not issue response messages, the resulting errors and problems were not reported back to Service B.
Which of the following statements describes a solution that correctly addresses these problems?
A. The Data Confidentiality and Data Origin Authentication patterns need to be applied in order to establish message-layer confidentiality and integrity for messages sent to Services C and D.
The Direct Authentication pattern can be applied to require that service consumer be authenticated in order to use Service A.
B. Apply the Service Perimeter Guard and the Message Screening patterns together to establish a perimeter service between Service Consumer A and Service A.
The perimeter service screens and authenticates incoming request messages from Service Consumer A.
After successful authentication, the perimeter service generates a signed SAML assertion that is used by the subsequent services to authenticate and authorize the request message and is also carried forward as the security credential included in messages sent to Services C and D.
C. Messages sent to Services C and D must be protected using transport-layer encryption in order to ensure data confidentiality. Service consumers of Service A must be authenticated using X.509 certificates because they can be reused for several request messages.
D. Apply the Brokered Authentication to establish an authentication broker between Service Consumer A and Service A that can carry out the Kerberos authentication protocol. Before invoking Service A, Service Consumer A must request a ticket granting ticket and then it must request service granting tickets to all services in the service composition, including Services C and D.
Messages sent by Service B to Services C and D must further be encrypted with the public key of Service Consumer A.
正解：A
Services A, B and C belong to Service Inventory A.
Services D, E and F belong to Service Inventory B.
Service C acts as an authentication broker for Service Inventory A.
Service F acts as an authentication broker for Service Inventory B.
Both of the authentication brokers use Kerberos-based authentication technologies. Upon receiving a request message from a service consumer, Services C and F authenticate the request using a local identity store and then use a separate Ticket Granting Service (not shown) to issue the Kerberos ticket to the service consumer.
Currently, tickets issued in one service inventory are not valid in the other. For example, if Service A wants to communicate with Services D or E, it must request a ticket from the Service Inventory B authentication broker (Service F). Because Service Inventory A and B trust each other, the current cross-inventory authentication is considered unnecessarily redundant.
How can these service inventory architectures be improved to avoid redundant authentication?
A. Create a single, enterprise-wide service inventory by merging Service Inventories A and B.
Instead of the current Kerberos-based brokered authentication, the merged service inventory can use X.509 digital certificates to remove the burden from the local authentication brokers. Designate either Service C or Service F as the central authentication service with the responsibility to validate service consumer X.509 digital certificates. After successful validation, the authentication service can issue a signed SAML token to be used within the entire service inventory.
B. The same Kerberos tickets can be used across both service inventories by updating the security policies of the services that require Kerberos tickets. Because each authentication broker issues Kerberos tickets, the only difference between these tickets is the identity of the issuer. For example, because services in Service Inventory A already accept Kerberos tickets issued by Service C, Service F just needs to be included in the security policies of these services. Similarly, services in Service Inventory B that accept Kerberos tickets issued by Service F need to include the acceptance of Kerberos tickets issued by Service C in their security policies.
C. Replace Services C and F with a single authentication broker so that one single token can be used with services across both service inventories. This can be achieved by merging the content of the two identity stores.
D. A trust relationship needs to be established between the two authentication brokers.
This trust relationship can enable the authentication brokers to accept Kerberos tickets issued by each other.
正解：D
質問 2：
A. Apply the Trusted Subsystem pattern together with the Data Origin Authentication pattern in order to establish a utility service that performs the security processing on behalf of Service A.
Service Consumer A must digitally sign all request messages and encrypt the credential information using the public key of the utility service. The utility service can then verify the security credentials and the digital signature to establish the validity of the request message. If the request message is permitted, the utility service establishes a composite trust domain that encompasses Service Consumer A, Service A, Database A, and the legacy system. Because all communications remain within a single trust domain, malicious intermediaries will not be able to gain access to any exchanged data.
B. Apply the Service Perimeter Guard pattern together with the Trusted Subsystem pattern to establish a perimeter service that can perform security functions on behalf of Service A.
The utility service can verify the validity of the request messages from Service Consumer A by authenticating the request message against an identity store. If the request message is authenticated, the utility service then sends it to Service A for further processing. All communications between Service A and Service Consumer A can be encrypted using the public key of the intended recipient, and signed using the private key of the sender.
Industry standards that can be used for this solution are XML-Encryption, XML-Signature, and WS-Trust.
C. Apply the Data Origin Authentication pattern together with the Data Confidentiality pattern in order to establish message-layer security that guarantees the confidentiality and integrity of messages exchanged by Service Consumer A and Service A.
Further, a security policy can be created to require that security credentials submitted to Service A must be digitally signed and encrypted and also contain a timestamp to validate the actual time the request was issued. Industry standards that can be used for this solution are WS- Policy, WS-SecurityPolicy, XML-Encryption, and XML-Signature.
D.
E. Apply the Service Perimeter Guard pattern to establish a perimeter service that can perform security functions on behalf of Service A.
Next, apply the Data Confidentiality pattern so that the security credential information provided by Service Consumer A with the request message is encrypted with the secret key shared between the perimeter service and Service Consumer A.
The perimeter service evaluates the credentials and if successfully authenticated, forwards the request message to Service A.
Transport-layer security is used to protect message exchanges between Service A and Service Consumer
正解：C,D
質問 3：
Service Consumer A sends a request message to Service A (1), after which Service A sends a request message with security credentials to Service B (2). Service B authenticates the request and, if the authentication is successful, writes data from the request message into Database B (3). Service B then sends a request message to Service C (4), which is not required to issue a response message. Service B then sends a response message back to Service A (5). After processing Service B's response, Service A sends another request message with security credentials to Service B (6). After successfully authenticating this second request message from Service A, Service B sends a request message to Service D (7). Service D is also not required to issue a response message. Finally, Service B sends a response message to Service A (8), after which Service A records the response message contents in Database A (9) before sending its own response message to Service Consumer A (10).
To use Service A, Service Consumer A is charged a per usage fee. The owner of Service Consumer A has filed a complaint with the owner of Service A, stating that the bills that have been issued are for more usage of Service A than Service Consumer A actually used.
Additionally, it has been discovered that malicious intermediaries are intercepting and modifying messages being sent from Service B to Services C and D.
Because Services C and D do not issue response messages, the resulting errors and problems were not reported back to Service B.
Which of the following statements describes a solution that correctly addresses these problems?
A. The Data Confidentiality and Data Origin Authentication patterns need to be applied in order to establish message-layer confidentiality and integrity for messages sent to Services C and D.
The Direct Authentication pattern can be applied to require that service consumer be authenticated in order to use Service A.
B. Apply the Service Perimeter Guard and the Message Screening patterns together to establish a perimeter service between Service Consumer A and Service A.
The perimeter service screens and authenticates incoming request messages from Service Consumer A.
After successful authentication, the perimeter service generates a signed SAML assertion that is used by the subsequent services to authenticate and authorize the request message and is also carried forward as the security credential included in messages sent to Services C and D.
C. Messages sent to Services C and D must be protected using transport-layer encryption in order to ensure data confidentiality. Service consumers of Service A must be authenticated using X.509 certificates because they can be reused for several request messages.
D. Apply the Brokered Authentication to establish an authentication broker between Service Consumer A and Service A that can carry out the Kerberos authentication protocol. Before invoking Service A, Service Consumer A must request a ticket granting ticket and then it must request service granting tickets to all services in the service composition, including Services C and D.
Messages sent by Service B to Services C and D must further be encrypted with the public key of Service Consumer A.
正解：A
叶*妹 -
幸い試験に合格しました。本当に助けになりました。
平日の仕事は忙しくて、講座に行きたいけど、全く時間が無い。S90.20問題集をかけて、簡単に勉強できる。本当に助かりました。