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NEW QUESTION: 1
Which of the following is the MOST important goal of risk management?
A. Assessing the impact of potential threats
B. Finding economic balance between the impact of the risk and the cost of the control
C. Identifying the risk
D. Identifying the victim of any potential exploits.
Answer: B
NEW QUESTION: 2
A. Option C
B. Option A
C. Option D
D. Option B
Answer: D
NEW QUESTION: 3
テーブル結合のUSING句とON句に関して正しいものはどれですか。
A. WHERE句を使用して、ONまたはUSING句を含むSELECTステートメントに追加の条件を適用できます。
B. USING句とON句の両方を等結合と非等結合に使用できます。
C. ON句を使用して、2つのテーブル間で最大1ペアの列を結合できます。
D. ON句を使用して、名前は異なるがデータ型に互換性がある列のテーブルを結合できます。
Answer: A,D
NEW QUESTION: 4
Which of the following statement INCORRECTLY describes network device such as a Router?
A. Router builds a routing table based on MAC address
B. Router creates a new header for each packet
C. Router assigns a different network address per port
D. Router does not forward broadcast packet
Answer: A
Explanation:
Explanation/Reference:
The INCORRECTLY keyword is used in the question. You need to find out a statement which is not valid about router. Router builds a routing table based on IP address and not on MAC address.
Difference between Router and Bridge:
Router
Bridge
Creates a new header for each packet
Does not alter header. Only reads the header
Builds routing table based on IP address
Build forwarding table based on MAC address
Assigns a different network address per port
Use the same network address for all ports
Filters traffic based on IP address
Filter traffic based on MAC address
Does not forward broadcast packet
Forward broadcast packet
Does not forward traffic that contain destination address unknown to the router Forward traffic if destination address is unknown to bridge For your exam you should know below information about network devices:
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 from: 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 from: 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 from: 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 from: http://static.howtoforge.com/
The following were incorrect answers:
The other options presented correctly describes about Router.
The following reference(s) were/was used to create this question:
CISA review manual 2014 Page number 263
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