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NEW QUESTION: 1
Which device acting as a translator is used to connect two networks or applications from layer 4 up to layer
7 of the ISO/OSI Model?
A. Gateway
B. Repeater
C. Router
D. Bridge
Answer: A
Explanation:
Explanation/Reference:
A gateway is used to connect two networks using dissimilar protocols at the lower layers or it could also be at the highest level of the protocol stack.
Important Note:
For the purpose of the exam, you have to remember that a gateway is not synonymous to the term firewall.
The second thing you must remembers is the fact that a gateway act as a translation device.
It could be used to translate from IPX to TCP/IP for example. It could be used to convert different types of applications protocols and allow them to communicate together. A gateway could be at any of the OSI layers but usually tend to be higher up in the stack.
For your exam you should know the information below:
Repeaters
A repeater provides the simplest type of connectivity, because it only repeats electrical signals between cable segments, which enables it to extend a network. Repeaters work at the physical layer and are add- on devices for extending a network connection over a greater distance. The device amplifies signals because signals attenuate the farther they have to travel.
Repeaters can also work as line conditioners by actually cleaning up the signals. This works much better when amplifying digital signals than when amplifying analog signals, because digital signals are discrete units, which makes extraction of background noise from them much easier for the amplifier. If the device is amplifying analog signals, any accompanying noise often is amplified as well, which may further distort the signal.
A hub is a multi-port repeater. A hub is often referred to as a concentrator because it is the physical communication device that allows several computers and devices to communicate with each other. A hub does not understand or work with IP or MAC addresses. When one system sends a signal to go to another system connected to it, the signal is broadcast to all the ports, and thus to all the systems connected to the concentrator.
Repeater
Image Reference- http://www.erg.abdn.ac.uk/~gorry/course/images/repeater.gif Bridges
A bridge is a LAN device used to connect LAN segments. It works at the data link layer and therefore works with MAC addresses. A repeater does not work with addresses; it just forwards all signals it receives. When a frame arrives at a bridge, the bridge determines whether or not the MAC address is on the local network segment. If the MAC address is not on the local network segment, the bridge forwards the frame to the necessary network segment.
Bridge
Image Reference- http://www.oreillynet.com/network/2001/01/30/graphics/bridge.jpg Routers
Routers are layer 3, or network layer, devices that are used to connect similar or different networks. (For example, they can connect two Ethernet LANs or an Ethernet LAN to a Token Ring LAN.) A router is a device that has two or more interfaces and a routing table so it knows how to get packets to their destinations. It can filter traffic based on access control lists (ACLs), and it fragments packets when necessary. Because routers have more network-level knowledge, they can perform higher-level functions, such as calculating the shortest and most economical path between the sending and receiving hosts.
Router and Switch
Image Reference- http://www.computer-networking-success.com/images/router-switch.jpg Switches
Switches combine the functionality of a repeater and the functionality of a bridge. A switch amplifies the electrical signal, like a repeater, and has the built-in circuitry and intelligence of a bridge. It is a multi-port connection device that provides connections for individual computers or other hubs and switches.
Gateways
Gateway is a general term for software running on a device that connects two different environments and that many times acts as a translator for them or somehow restricts their interactions. Usually a gateway is needed when one environment speaks a different language, meaning it uses a certain protocol that the other environment does not understand. The gateway can translate Internetwork Packet Exchange (IPX) protocol
packets to IP packets, accept mail from one type of mail server and format it so another type of mail server can accept and understand it, or connect and translate different data link technologies such as FDDI to Ethernet.
Gateway Server
Image Reference- http://static.howtoforge.com/images/screenshots/556af08d5e43aa768260f9e589dc547f-
3024.jpg
The following answers are incorrect:
Repeater - A repeater provides the simplest type of connectivity, because it only repeats electrical signals between cable segments, which enables it to extend a network. Repeaters work at the physical layer and are add-on devices for extending a network connection over a greater distance. The device amplifies signals because signals attenuate the farther they have to travel.
Bridges - A bridge is a LAN device used to connect LAN segments. It works at the data link layer and therefore works with MAC addresses. A repeater does not work with addresses; it just forwards all signals it receives. When a frame arrives at a bridge, the bridge determines whether or not the MAC address is on the local network segment. If the MAC address is not on the local network segment, the bridge forwards the frame to the necessary network segment.
Routers - Routers are layer 3, or network layer, devices that are used to connect similar or different networks. (For example, they can connect two Ethernet LANs or an Ethernet LAN to a Token Ring LAN.) A router is a device that has two or more interfaces and a routing table so it knows how to get packets to their destinations. It can filter traffic based on access control lists (ACLs), and it fragments packets when necessary.
Following reference(s) were/was used to create this question:
CISA review manual 2014 Page number 263
Official ISC2 guide to CISSP CBK 3rd Edition Page number 229 and 230
NEW QUESTION: 2
What are the data model for custom objects?
A. It includes full PFCG roles, the entry page of a work center, and
authorization.
B. Maintain Distribution Model (MD64)
C. Starting with EhP6, a sample data mode SF (SFLIGHT) is delivered.
D. Generate Partner Profiles (WE20)
Answer: A,C
NEW QUESTION: 3
회사는 최대 30 일 동안 작은 데이터 레코드 (최대 1 KiB)를 비용 효율적으로 유지해야합니다. 데이터는 거의 읽히지 않습니다. 데이터를 읽을 때 5 분 지연이 허용됩니다.
다음 중 어떤 솔루션이이 목표를 달성합니까? (2 개를 선택하십시오.)
A. Amazon API Gateway를 통해 호출 된 AWS Lambda 함수를 사용하여 5 분 동안 데이터를 수집하십시오. Lambda 실행이 중지되기 직전에 Amazon S3에 데이터를 씁니다.
B. TTL (Time To Live) 30 일로 구성된 Amazon DynamoDB에 레코드를 씁니다. GetItem 또는 BatchGetItem 호출을 사용하여 데이터를 읽습니다.
C. Amazon Kinesis Data Firehose에 레코드를 쓰고 5 분 후에 Amazon S3에 데이터를 전달하도록 Kinesis Data Firehose를 구성하십시오. S3 버킷에서 30 일에 만료 조치를 설정하십시오.
D. Redis 용 Amazon ElastiCache에 레코드를 씁니다. Amazon S3에 쓰도록 Redis 추가 전용 파일 (AOF) 지속성 로그를 구성하십시오. ElastiCache 인스턴스가 실패한 경우 로그에서 복구하십시오.
E. Amazon S3를 사용하여 하나의 S3 객체에서 여러 레코드를 수집합니다. 수명주기 구성을 사용하여 쓰기 직후에 Amazon Glacier로 데이터를 이동하십시오. 데이터를 읽을 때 빠른 검색을 사용하십시오.
Answer: B,C
Explanation:
A: After 30 days the data should be deleted instead of storing it.
B: When an object reaches the end of its lifetime, Amazon S3 queues it for removal and removes it asynchronously. There may be a delay between the expiration date and the date at which Amazon S3 removes an object. You are not charged for storage time associated with an object that has expired.
C: Does not address the 30 days deletion.
D: https://aws.amazon.com/blogs/aws/new-manage-dynamodb-items-using-time-to-live-ttl/ E: This is for cache and not suitable for this use case.
https://docs.aws.amazon.com/AmazonS3/latest/dev/lifecycle-expire-general-considerations.html