Network Topologies in Objective-C

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Network Topologies
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3 A A bus topology uses a single cable to connect all devices together B uses a central device, which has point-to-point connections to other devices C is a single connection between two devices D is where one device is connected to another, which is connected to another, and so on, until the last device is connected to the first device, forming a ring 4 B FDDI has both physical and logical ring structures A, depending on the type, uses a physical star or bus topology, but all types use a logical bus topology C uses a physical star topology and a logical ring topology D doesn t have a physical or logical topology per se, since it uses airwaves; it definitely doesn t use any type of ring topology, but uses a logical bus topology 5 B Ethernet 10Base2 and 10Base5 have both physical and logical bus topologies A has a physical star topology and a logical bus topology C and D are incorrect because 10BaseT has a physical star topology and a logical bus topology 6 B A logical topology describes how devices communicate with each other A defines how devices are connected to each other C and D are nonexistent topology types
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Introduction to Network Security
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7 B An adversary is a general term used to describe an attacker (hacker, criminal, terrorist, company spy, disgruntled employee, and so on) A and D are not security terms C is a class of attack
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1: Networks
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8 A A passive attack monitors unencrypted traffic looking for clear-text passwords and sensitive information that can be used in other types of attacks With B, the attacker tries to bypass or break into secured systems C requires the adversary to introduce code, such as a Trojan horse or back-door program, to a trusted component or software that will later be distributed to many companies and users D involves someone attempting to get physically close to network components, data, and systems to learn more about a network 9 D Maintenance threats include not having backup parts or components for critical network components, not labeling components and their cabling correctly, causing problems when performing maintenance in and around network components, and not following electrostatic discharge procedures before handling network components A involves physical damage to network components, such as servers, routers, and switches B includes irregular fluctuations in voltage, such as brownouts and voltage spikes, and complete loss of power C is a nonexistent physical threat 10 B An access attack occurs when someone tries to gain unauthorized access to a component or information on a component or increases his privileges on a network component; one of the most common types of access attacks is a password attack A occurs when an adversary is trying to learn information about your network C is a nonexistent security term for attacks D involves an adversary reducing the level of operation or service, preventing access to, or completely crashing a network component or service
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201 202 203 Introduction to the OSI Reference Model Layers of the OSI Reference Model Encapsulation and De-encapsulation
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2: OSI Reference Model
efore you can successfully configure Cisco switches and routers, you must understand some basic networking concepts outlined in this chapter and advanced concepts discussed in later chapters The Open Systems Interconnection (OSI) Reference Model is the best place to start, since it will help you understand how information is transferred between networking components Of the seven layers in the OSI Reference Model, you should understand how the bottom three layers function, since most networking components function at these layers This chapter covers how traffic is generally moved between network components, using the OSI Reference Model to illustrate the encapsulation and de-encapsulation process 10 will go into this process in much more depth, focusing on the use of TCP/IP to transmit data between network components
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