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NEW QUESTION: 1
In which layer of the OSI Model are connection-oriented protocols located in the TCP/IP suite of protocols?
A. Application layer
B. Physical layer
C. Transport layer
D. Network layer
Answer: C
Explanation:
Explanation/Reference:
Connection-oriented protocols such as TCP provides reliability.
It is the responsibility of such protocols in the transport layer to ensure every byte is accounted for. The network layer does not provide reliability. It only privides the best route to get the traffic to the final destination address.
For your exam you should know the information below about OSI model:
The Open Systems Interconnection model (OSI) is a conceptual model that characterizes and standardizes the internal functions of a communication system by partitioning it into abstraction layers. The model is a product of the Open Systems Interconnection project at the International Organization for Standardization (ISO), maintained by the identification ISO/IEC 7498-1.
The model groups communication functions into seven logical layers. A layer serves the layer above it and is served by the layer below it. For example, a layer that provides error-free communications across a network provides the path needed by applications above it, while it calls the next lower layer to send and receive packets that make up the contents of that path. Two instances at one layer are connected by a horizontal.
OSI Model

Image source: http://www.petri.co.il/images/osi_model.JPG
PHYSICAL LAYER
The physical layer, the lowest layer of the OSI model, is concerned with the transmission and reception of the unstructured raw bit stream over a physical medium. It describes the electrical/optical, mechanical, and functional interfaces to the physical medium, and carries the signals for all of the higher layers. It provides:
Data encoding: modifies the simple digital signal pattern (1s and 0s) used by the PC to better accommodate the characteristics of the physical medium, and to aid in bit and frame synchronization. It determines:
What signal state represents a binary 1
How the receiving station knows when a "bit-time" starts
How the receiving station delimits a frame
DATA LINK LAYER
The data link layer provides error-free transfer of data frames from one node to another over the physical layer, allowing layers above it to assume virtually error-free transmission over the link. To do this, the data link layer provides:
Link establishment and termination: establishes and terminates the logical link between two nodes.
Frame traffic control: tells the transmitting node to "back-off" when no frame buffers are available.
Frame sequencing: transmits/receives frames sequentially.
Frame acknowledgment: provides/expects frame acknowledgments. Detects and recovers from errors that occur in the physical layer by retransmitting non-acknowledged frames and handling duplicate frame receipt.
Frame delimiting: creates and recognizes frame boundaries.
Frame error checking: checks received frames for integrity.
Media access management: determines when the node "has the right" to use the physical medium.
NETWORK LAYER
The network layer controls the operation of the subnet, deciding which physical path the data should take based on network conditions, priority of service, and other factors. It provides:
Routing: routes frames among networks.
Subnet traffic control: routers (network layer intermediate systems) can instruct a sending station to
"throttle back" its frame transmission when the router's buffer fills up.
Frame fragmentation: if it determines that a downstream router's maximum transmission unit (MTU) size is less than the frame size, a router can fragment a frame for transmission and re-assembly at the destination station.
Logical-physical address mapping: translates logical addresses, or names, into physical addresses.
Subnet usage accounting: has accounting functions to keep track of frames forwarded by subnet intermediate systems, to produce billing information.
Communications Subnet
The network layer software must build headers so that the network layer software residing in the subnet intermediate systems can recognize them and use them to route data to the destination address.
This layer relieves the upper layers of the need to know anything about the data transmission and intermediate switching technologies used to connect systems. It establishes, maintains and terminates connections across the intervening communications facility (one or several intermediate systems in the communication subnet).
In the network layer and the layers below, peer protocols exist between a node and its immediate neighbor, but the neighbor may be a node through which data is routed, not the destination station. The source and destination stations may be separated by many intermediate systems.
TRANSPORT LAYER
The transport layer ensures that messages are delivered error-free, in sequence, and with no losses or duplications. It relieves the higher layer protocols from any concern with the transfer of data between them and their peers.
The size and complexity of a transport protocol depends on the type of service it can get from the network layer. For a reliable network layer with virtual circuit capability, a minimal transport layer is required. If the network layer is unreliable and/or only supports datagrams, the transport protocol should include extensive error detection and recovery.
The transport layer provides:
Message segmentation: accepts a message from the (session) layer above it, splits the message into smaller units (if not already small enough), and passes the smaller units down to the network layer. The transport layer at the destination station reassembles the message.
Message acknowledgment: provides reliable end-to-end message delivery with acknowledgments.
Message traffic control: tells the transmitting station to "back-off" when no message buffers are available.
Session multiplexing: multiplexes several message streams, or sessions onto one logical link and keeps track of which messages belong to which sessions (see session layer).
Typically, the transport layer can accept relatively large messages, but there are strict message size limits imposed by the network (or lower) layer. Consequently, the transport layer must break up the messages into smaller units, or frames, prepending a header to each frame.
The transport layer header information must then include control information, such as message start and message end flags, to enable the transport layer on the other end to recognize message boundaries. In addition, if the lower layers do not maintain sequence, the transport header must contain sequence information to enable the transport layer on the receiving end to get the pieces back together in the right order before handing the received message up to the layer above.
End-to-end layers
Unlike the lower "subnet" layers whose protocol is between immediately adjacent nodes, the transport layer and the layers above are true "source to destination" or end-to-end layers, and are not concerned with the details of the underlying communications facility. Transport layer software (and software above it) on the source station carries on a conversation with similar software on the destination station by using message headers and control messages.
SESSION LAYER
The session layer allows session establishment between processes running on different stations. It provides:
Session establishment, maintenance and termination: allows two application processes on different machines to establish, use and terminate a connection, called a session.
Session support: performs the functions that allow these processes to communicate over the network, performing security, name recognition, logging, and so on.
PRESENTATION LAYER
The presentation layer formats the data to be presented to the application layer. It can be viewed as the translator for the network. This layer may translate data from a format used by the application layer into a common format at the sending station, then translate the common format to a format known to the application layer at the receiving station.
The presentation layer provides:
Character code translation: for example, ASCII to EBCDIC.
Data conversion: bit order, CR-CR/LF, integer-floating point, and so on.
Data compression: reduces the number of bits that need to be transmitted on the network.
Data encryption: encrypt data for security purposes. For example, password encryption.
APPLICATION LAYER
The application layer serves as the window for users and application processes to access network services. This layer contains a variety of commonly needed functions:
Resource sharing and device redirection
Remote file access
Remote printer access
Inter-process communication
Network management
Directory services
Electronic messaging (such as mail)
Network virtual terminals
The following were incorrect answers:
Application Layer - The application layer serves as the window for users and application processes to access network services.
Network layer - The network layer controls the operation of the subnet, deciding which physical path the data should take based on network conditions, priority of service, and other factors.
Physical Layer - The physical layer, the lowest layer of the OSI model, is concerned with the transmission and reception of the unstructured raw bit stream over a physical medium. It describes the electrical/optical, mechanical, and functional interfaces to the physical medium, and carries the signals for all of the higher layers.
The following reference(s) were/was used to create this question:
CISA review manual 2014 Page number 260
and
Official ISC2 guide to CISSP CBK 3rd Edition Page number 287
and
http://en.wikipedia.org/wiki/Tcp_protocol

NEW QUESTION: 2
Access delivery rules provide which two of the following functions? (Choose two.)
A. Enforce specific TLS requirements.
B. Block access to specific protected domains.
C. Route the delivery of email messages to alternate mailboxes.
D. Trigger IBE or S/MIME encryption.
Answer: B,C

NEW QUESTION: 3
Which active DAS component is responsible for coupling input signals from donor systems?
A. Coupling antenna
B. Receiver
C. Transceiver
D. Bidirectional amplifier
Answer: D

NEW QUESTION: 4
한 회사가 아시아 및 남미 지역의 잠재 고객을 대상으로하는 새 버전의 웹 사이트를 출시했습니다. 웹 사이트의 미디어 자산은 Amazon S3에서 호스팅되며 최종 사용자 성능을 개선하기위한 Amazon CloudFront 배포가 있습니다. 그러나 사용자의 로그인 환경이 좋지 않아 인증 서비스는 us-east-1 AWS 리전에서만 사용할 수 있습니다.
Solutions Architect는 어떻게 로그인 환경을 개선하고 최소한의 관리 오버 헤드로 높은 보안과 성능을 유지할 수 있습니까?
A. 각각의 새로운 지역에서 설정을 복제하고 Amazon Route 53 지역 기반 라우팅을 사용하여 트래픽을 사용자와 가장 가까운 AWS 리전으로 라우팅합니다.
B. CloudFront 뷰어 요청 트리거에 연결된 Amazon Lambda @ Edge를 사용하여 세션 만료시 보안 쿠키 토큰을 유지하여 사용자를 인증하고 권한을 부여하여 여러 지역에서 사용자 경험을 개선합니다.
C. 각 지역의 설정을 복제하고 Network Load Balancer를 사용하여 사용자에게 가장 가까운 지역에서 실행중인 인증 서비스로 트래픽을 라우팅합니다.
D. Amazon Route 53 가중치 라우팅 정책을 사용하여 트래픽을 CloudFront 배포로 라우팅합니다. CloudFront 캐시 된 HTTP 메서드를 사용하여 사용자 로그인 환경을 개선합니다.
Answer: B