QUESTION: 82

The IPSec protocol is configured in an organization's network in order to maintain a complete infrastructure for secured network communications. IPSec uses four components for this.
Which of the following components reduces the size of data transmitted over congested network connections and increases the speed of such networks without losing data?

AH
ESP
IPcomp
IKE

Answer(s): C

Explanation:

The IP Payload Compression (IPcomp) protocol is a low level compression protocol for IP datagrams defined in RFC 3173. The goal of IPcomp protocol is to reduce the size of data transmitted over congested or slow network connections, thereby increasing the speed of such networks without losing data. According to the RFC requirements, compression must be done before fragmenting or encrypting the packet. It further states that each datagram must be compressed independently; so it can be decompressed even if received out of order. This is important because it allows IPComp to work with both TCP and UDP network communications. Answer option A is incorrect. Authentication Header (AH) is an IPsec protocol. The AH provides connectionless integrity and data origin authentication of IP packets. It can also protect the IP packets against replay attacks by using the sliding window technique and discarding old packets. The AH protects the IP payload and all header fields of an IP datagram except for mutable fields.
Answer option B is incorrect. Encapsulating Security Payload (ESP) is an IPSec protocol that provides confidentiality with authentication, integrity, and anti-replay. ESP can be used alone in combination with Authentication Header (AH).
ESP can also be used nested with the Layer
Two Tunneling Protocol (L2TP). Normally, ESP does not sign the entire packet unless it is being tunneled. Typically, only the data payload is protected, not the IP header.
Answer option D is incorrect. IKE (Internet Key Exchange) is the protocol used to set up a security association (SA) in the IPsec protocol suite.
IKE uses a Diffie-Hellman key exchange to set up a shared session secret, from which cryptographic keys are derived. Public key techniques or alternatively pre-shared keys are used to mutually authenticate the communicating parties.

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QUESTION: 83

You work as a CSO (Chief Security Officer) for Tech Perfect Inc. You want to perform the following tasks:
Develop a risk-driven enterprise information security architecture. Deliver security infrastructure solutions that support critical business initiatives.
Which of the following methods will you use to accomplish these tasks?

Service-oriented architecture
Sherwood Applied Business Security Architecture
Service-oriented modeling framework
Service-oriented modeling and architecture

Answer(s): B

Explanation:

SABSA (Sherwood Applied Business Security Architecture) is a framework and methodology for Enterprise Security Architecture and Service Management. SABSA is a model and a methodology for developing risk-driven enterprise information security architectures and for delivering security infrastructure solutions that support critical business initiatives. The primary characteristic of the SABSA model is that everything must be derived from an analysis of the business requirements for security, especially those in which security has an enabling function through which new business opportunities can be developed and exploited. Answer option C is incorrect. The service-oriented modeling framework (SOMF) is a service-oriented development life cycle methodology. It offers a number of modeling practices and disciplines that contribute to a successful service-oriented life cycle management and modeling. The service-oriented modeling framework illustrates the major elements that identify the "what to do" aspects of a service development scheme.
Answer option D is incorrect. The service-oriented modeling and architecture (SOMA) includes an analysis and design method that extends traditional object-oriented and component-based analysis and design methods to include concerns relevant to and supporting SOA.
Answer option A is incorrect. The service-oriented architecture (SOA) is a flexible set of design principles used during the phases of systems development and integration.

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QUESTION: 84

A network is configured on a Bus topology.
Which of the following conditions could cause a network failure?
Each correct answer represents a complete solution. Choose all that apply.

A break in a network cable
75 ohm terminators at open ends
A powered off workstation
An open-ended cable without terminators

Answer(s): A,B,D

Explanation:

The following conditions could cause a network failure in a Bus topology:
An open-ended cable without terminators
75 ohm terminators at open ends
A break in a network cable
Bus topology is a type of physical network design where all computers in the network are connected through a single coaxial cable known as bus. This topology uses minimum cabling and is therefore, the simplest and least expensive topology for small networks. In this topology, 50 ohm terminators terminate both ends of the network. A Bus topology network is difficult to troubleshoot, as a break or problem at any point along the cable can cause the entire network to go down.

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QUESTION: 85

Which of the following is an input device that is used for controlling machines such as cranes, trucks, underwater unmanned vehicles,
wheelchairs, surveillance cameras, and zero turning radius lawn mowers?

PS/2
Joystick
Microphone
AGP

Answer(s): B

Explanation:

A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. Joysticks are often used to control video games, and usually have one or more push-buttons whose state can also be read by the computer. A popular variation of the joystick used on modern video game consoles is the analog stick.

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