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NEW QUESTION: 1
IKEリアルタイムデバッグの部分的な出力を示す展示を調べます。
出力に関する次の記述のうち、正しいものはどれですか？
A. Remoteは、リモートIPsecピアのホスト名です。
B. 拡張認証（XAuth）は成功しました。
C. フェーズ1がダウンしました。
D. 事前共有キー認証を使用するようにVPNが構成されています。
Answer: D
NEW QUESTION: 2
Which of the following commands is required to configure an Ethernet port to be used as a SAP in a service?
A. Configure port port-id mode access
B. Configure port port-idEthernetmode access
C. Configure service sap sap-id access
D. Configure port port-idEthernetmode network
E. Configure port port-id mode network
Answer: B
NEW QUESTION: 3
Company B is launching a new game app for mobile devices. Users will log into the game using their existing social media account to streamline data capture. Company B would like to directly save player data and scoring information from the mobile app to a DynamoDS table named Score Data When a user saves their game the progress data will be stored to the Game state 53 bucket. What is the best approach for storing data to DynamoDB and 53?
A. Use temporary security credentials that assume a role providing access to the Score Data DynamoDB table and the Game State 53 bucket using web identity federation.
B. Use Login with Amazon allowing users to sign in with an Amazon account providing the mobile app with access to the Score Data DynamoDB table and the Game State 53 bucket.
C. Use an lAM user with access credentials assigned a role providing access to the Score Data DynamoDB table and the Game State 53 bucket for distribution with the mobile app.
D. Use an EC2 Instance that is launched with an EC2 role providing access to the Score Data DynamoDB table and the GameState 53 bucket that communicates with the mobile app via web services.
Answer: A
Explanation:
Web Identity Federation
Imagine that you are creating a mobile app that accesses AWS resources, such as a game that runs on a mobile device and stores player and score information using Amazon 53 and DynamoDB. When you write such an app, you'll make requests to AWS services that must be signed with an AWS access key.
However, we strongly recommend that you do not embed or distribute long-term AWS credentials with apps that a user downloads to a device, even in an encrypted store. Instead, build your app so that it requests temporary AWS security credentials dynamically when needed using web identity federation.
The supplied temporary credentials map to an AWS role that has only the permissions needed to perform the tasks required by the mobile app.
With web identity federation, you don't need to create custom sign-in code or manage your own user identities. Instead, users of your app can sign in using a well-known identity provider (ldP) - such as Login with Amazon, Facebook, Google, or any other OpenID Connect (OIDC)-compatible ldP, receive an authentication token, and then exchange that token for temporary security credentials in AWS that map to an lAM role with permissions to use the resources in your AWS account. Using an ldP helps you keep your AWS account secure, because you don't have to embed and distribute longterm security credentials with your application.
For most scenarios, we recommend that you use Amazon Cognito because it acts as an identity broker and does much of the federation work for you. For details, see the following section, Using Amazon Cognito for Mobile Apps.
If you don't use Amazon Cognito, then you must write code that interacts with a web ldP (Login with Amazon, Facebook, Google, or any other OIDC-compatible ldP) and then calls the Assume Role With Web ldentity API to trade the authentication token you get from those ldPs for AWS temporary security credentials. If you have already used this approach for existing apps, you can continue to use it.
Using Amazon Cognito for Mobile Apps
The preferred way to use web identity federation is to use Amazon Cognito. For example, Adele the developer is building a game for a mobile device where user data such as scores and profiles is stored in Amazon 53 and Amazon DynamoDB. Adele could also store this data locally on the device and use Amazon Cognito to keep it synchronized across devices. She knows that for security and maintenance reasons, long-term AWS security credentials should not be distributed with the game. She also knows that the game might have a large number of users. For all of these reasons, she does not want to create new user identities in lAM for each player. Instead, she builds the game so that users can sign in using an identity that they've already established with a well-known identity provider, such as Login with Amazon, Facebook, Google, or any OpenID Connect {OIDC)-compatible identity provider.
Her game can take advantage of the authentication mechanism from one of these providers to validate the user's identity.
To enable the mobile app to access her AWS resources, Adele first registers for a developer 10 with her chosen ldPs. She also configures the application with each of these providers. In her AWS account that contains the Amazon 53 bucket and DynamoDB table for the game, Adele uses Amazon Cognito to create lAM roles that precisely define permissions that the game needs. If she is using an OIDC ldP, she also creates an lAM OIDC identity provider entity to establish t rust between her AWS account and the ldP.
In the app's code, Adele calls the sign-in interface for the ldP that she configured previously. The ldP handles all the details of letting the user sign in, and the app gets an OAuth access token or OIDC ID token from the provider. Adele's app can trade this authentication information for a set of temporary security credentials that consist of an AWS access key 10, a secret access key, and a session token.
The app can then use these credentials to access web services offered by AWS. The app is limited to the permissions that are defined in the role that it assumes.
The following figure shows a simplified flow for how this might work, using Login with Amazon as the ldP.
For Step 2, the app can also use Facebook, Google, or any OIDC-compatible identity provider, but that's not shown here.
Sample workflow using Amazon Cognito to federate users for a mobile application
A customer starts your app on a mobile device. The app asks the user to sign in.
The app uses Login with Amazon resources to accept the user's credentials.
The app uses Cognito APIs to exchange the Login with Amazon 10 token for a Cognito token.
The app requests temporary security credentials from AWS STS, passing the Cognito token.
The temporary security credentials can be used by the app to access any AWS resources required by the app to operate. The role associated with the temporary security credentials and its assigned policies determines what can be accessed.
Use the following process to configure your app to use Amazon Cognito to authenticate users and give your app access to AWS resources. For specific steps to accomplish this scenario, consult the documentation for Amazon Cognito.
(Optional) Sign up as a developer with Login with Amazon, Facebook, Google, or any other OpenID Connect (OIDC}-compatible identity provider and configure one or more apps with the provider. This step is optional because Amazon Cognito also supports unauthenticated (guest) access for your users.
Go to Amazon Cognito in the AWS Management Console. Use the Amazon Cognito wizard to create an identity pool, which is a container that Amazon Cognito uses to keep end user identities organized for your apps. You can share identity pools between apps. When you set up an identity pool, Amazon Cognito creates one or two lAM roles (one for authenticated identities, and one for unauthenticated
"guest" identities) that define permissions for Amazon Cognito users.
Download and integrate the AWS SDK for iOS or the AWS SDK for Android with your app, and import the files required to use Amazon Cognito.
Create an instance of the Amazon Cognito credentials provider, passing the identity pool ID, your AWS account number, and the Amazon Resource Name (ARN) of the ro les that you associated with the identity pool. The Amazon Cognito wizard in the AWS Management Console provides sample code to help you get started.
When your app accesses an AWS resource, pass the credentials provider instance to the client object, which passes temporary security credentials to the client. The permissions for the credentials are based on the role or roles that you defined earlier.
NEW QUESTION: 4
How many bits is the address space reserved for the source IP address within an IPv6 header?
A. 0
B. 1
C. 2
D. 3
Answer: C
Explanation:
Discussion: An IPv6 address space is 128 bits or: 2128 = 340,282,366,920,938,463,463,374,607,431,768,211,456
When IPv4 was conceived in the late 1970s they thought that we would never need 4.3 Billion addresses but we ran out of them years ago. It is not likely that we will ever run out of addresses any time soon with numbers like those. We've gotten by with IPv4 by using NAT - Network Address Translation where private IP
Addresses are used by a single or a few externally routable IP Addresses.
Unfortunately, early on companies were given huge blocks of address spaces like class A
networks with 224 or 16,777,216 addresses even when only a small handful were used within the
company. Also, 127.0.0.0 loopback wasted as many.
IPv6 addresses are written in 8 groups of 4 hexadecimal digits separated by colons like this:
2001:0db8:85a3:0000:0000:8a2e:0370:7334
What is an IPv6 Header?
An Internet Protocol version 6 (IPv6) data packet comprises of two main parts: the header and the
payload. The first 40 bytes/octets (40x8 = 320 bits) of an IPv6 packet comprise of the header (see
Figure 1) that contains the following fields:
IPv6
Source address (128 bits) The 128-bit source address field contains the IPv6 address of the
originating node of the packet. It is the address of the originator of the IPv6 packet.
Destination address (128 bits) The 128-bit contains the destination address of the recipient node
of the IPv6 packet. It is the address of the intended recipient of the IPv6 packet.
Version/IP version (4-bits) The 4-bit version field contains the number 6. It indicates the version of
the IPv6 protocol. This field is the same size as the IPv4 version field that contains the number 4.
However, this field has a limited use because IPv4 and IPv6 packets are not distinguished based
on the value in the version field but by the protocol type present in the layer 2 envelope.
Packet priority/Traffic class (8 bits) The 8-bit Priority field in the IPv6 header can assume different
values to enable the source node to differentiate between the packets generated by it by
associating different delivery priorities to them. This field is subsequently used by the originating
node and the routers to identify the data packets that belong to the same traffic class and
distinguish between packets with different priorities.
Flow Label/QoS management (20 bits) The 20-bit flow label field in the IPv6 header can be used
by a source to label a set of packets belonging to the same flow. A flow is uniquely identified by
the combination of the source address and of a non-zero Flow label. Multiple active flows may
exist from a source to a destination as well as traffic that are not associated with any flow (Flow
label = 0).
The IPv6 routers must handle the packets belonging to the same flow in a similar fashion. The
information on handling of IPv6 data packets belonging to a given flow may be specified within the
data packets themselves or it may be conveyed by a control protocol such as the RSVP
(Resource reSerVation Protocol).
When routers receive the first packet of a new flow, they can process the information carried by
the IPv6 header, Routing header, and Hop-by-Hop extension headers, and store the result (e.g.
determining the retransmission of specific IPv6 data packets) in a cache memory and use the result to route all other packets belonging to the same flow (having the same source address and the same Flow Label), by using the data stored in the cache memory.
Payload length in bytes(16 bits) The 16-bit payload length field contains the length of the data field in octets/bits following the IPv6 packet header. The 16-bit Payload length field puts an upper limit on the maximum packet payload to 64 kilobytes. In case a higher packet payload is required, a Jumbo payload extension header is provided in the IPv6 protocol. A Jumbo payload (Jumbogram) is indicated by the value zero in the Payload Length field. Jumbograms are frequently used in supercomputer communication using the IPv6 protocol to transmit heavy data payload. Next Header (8 bits) The 8-bit Next Header field identifies the type of header immediately following the IPv6 header and located at the beginning of the data field (payload) of the IPv6 packet. This field usually specifies the transport layer protocol used by a packet's payload. The two most common kinds of Next Headers are TCP (6) and UDP (17), but many other headers are also possible. The format adopted for this field is the one proposed for IPv4 by RFC 1700. In case of IPv6 protocol, the Next Header field is similar to the IPv4 Protocol field.
Time To Live (TTL)/Hop Limit (8 bits) The 8-bit Hop Limit field is decremented by one, by each node (typically a router) that forwards a packet. If the Hop Limit field is decremented to zero, the packet is discarded. The main function of this field is to identify and to discard packets that are stuck in an indefinite loop due to any routing information errors. The 8-bit field also puts an upper limit on the maximum number of links between two IPv6 nodes. In this way, an IPv6 data packet is allowed a maximum of 255 hops before it is eventually discarded. An IPv6 data packet can pas through a maximum of 254 routers before being discarded.
In case of IPv6 protocol, the fields for handling fragmentation do not form a part of the basic header. They are put into a separate extension header. Moreover, fragmentation is exclusively handled by the sending host. Routers are not employed in the Fragmentation process.
For further details, please see RFC 2460 - Internet Protocol, Version 6 (IPv6) Specification.
The following answers are incorrect:
-32: This answer would be right if the question was about IPv4 but it isn't so the answer is wrong. 32 Bits yields 4,294,967,296 unique IP Address and considering the RFC for that was released in 1981, IPv4 has proven to have a remarkable lifespan. After more than 30 years and the huge growth the internet it's no wonder its lifespan is coming to an end.
-64: This is only half the size of an IPv6 header address space so this isn't correct. 64 Bits would yield a huge number of addresses which probably would have been enough but designers wanted to be sure to never ever run out of addresses on planet earth with 128-bit address spaces in IPv6.
-256: This isn't correct because 256 is twice the size of an IPv6 address size, far to many addresses necessary at this or any other point in time.
The following reference(s) was used to create this question:
Gregg, Michael; Haines, Billy (2012-02-16). CASP: CompTIA Advanced Security Practitioner
Study Guide Authorized Courseware: Exam CAS-001 (p. 53). Wiley. Kindle Edition.
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