1 Computer Networks And The Internet 2 Application Layer 3 Transport Layer 4 The Network Layer: Data Plane 5 The Network Layer: Control Plane 6 The Link Layer And Lans 7 Wireless And Mobile Networks 8 Security In Computer Networks 9 Multimedia Networking Chapter1: Computer Networks And The Internet
1.1 What Is The Internet? 1.2 The Network Edge 1.3 The Network Core 1.4 Delay, Loss, And Throughput In Packet-switched Networks 1.5 Protocol Layers And Their Service Models 1.6 Networks Under Attack 1.7 History Of Computer Networking And The Internet 1.8 Summary Chapter Questions Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end... Problem R2RQ: The word protocol is often used to describe diplomatic relations. How does Wikipedia describe... Problem R3RQ: Why are standards important for protocols? Problem R4RQ Problem R5RQ Problem R6RQ Problem R7RQ Problem R8RQ Problem R9RQ Problem R10RQ Problem R11RQ Problem R12RQ: What advantage does a circuit-switched network have over a packet-switched network? What advantages... Problem R13RQ Problem R14RQ Problem R15RQ Problem R16RQ Problem R17RQ Problem R18RQ Problem R19RQ: Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links,... Problem R20RQ Problem R21RQ Problem R22RQ Problem R23RQ: What are the five layers in the Internet protocol stack? What are the principal responsibilities of... Problem R24RQ Problem R25RQ Problem R26RQ Problem R27RQ Problem R28RQ Problem P2P: Equation 1.1 gives a formula for the end-to-end delay of sending one packet of length L over N links... Problem P3P Problem P4P Problem P5P Problem P6P: This elementary problem begins to explore propagation delay and transmission delay, two central... Problem P7P Problem P8P: Suppose users share a 3 Mbps link. Also suppose each user requires 150 kbps when transmitting, but... Problem P9P Problem P10P Problem P11P: In the above problem, suppose R1 = R2 = R3 = R and dproc = 0. Further suppose the packet switch does... Problem P13P Problem P14P: Consider the queuing delay in a router buffer. Let I denote traffic intensity; that is, I = La/R.... Problem P15P Problem P16P Problem P17P Problem P20P Problem P21P Problem P22P Problem P23P Problem P24P Problem P25P Problem P26P Problem P27P Problem P28P Problem P29P Problem P30P Problem P31P Problem P32P Problem P33P Problem P34P Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Book title: Cybersecurity Essentials Chapter 1 - Infrastructure security in the Real world
From the information provided in the first scenario, consider the National Institute of Standards and Technology (NIST) functions detailed in this section and observe how they relate to each category.
1. What inventory of physical assets (devices and systems) can be created within the substation (NIST ID.AM-1)?
(Refer to screenshot for reference)
Transcribed Image Text: Security Challenges
The NIST Cybersecurity Framework was developed by the U.S. National Institute of Standards and Technology
(NIST) to provide a set of independent guidelines that organizations can use to implement or upgrade their
cybersecurity programs. Because the framework is a product-independent tool, it provides guidelines that any
organization can tailor to meet its own cybersecurity needs.
The frameworks are divided into five functions (Identify, Protect, Detect, Respond, and Recover) that provide a top-
level description of the cybersecurity development process. Each function is then divided into applicable categories
that underpin the stated function. Each category is further divided into subcategories and implementation
methodology. Finally, the subcategories are supported by lists of reference documents that contain the nuts and bolt
of building the cybersecurity program.
This chapter will kickstart your thought processes for what you are about to learn in Part I. It contains two specific
cybersecurity scenarios to which you will be asked to apply the NIST Framework in order to produce a cybersecurity
solution that meets the desired objectives. In each case, you will be provided with specific subcategories to research,
along with some guidance to help you produce your solutions.
In this first pass through the scenarios, you are expected to generate and record general observations about securing
the infrastructure described, as you have not yet been introduced to the supporting material. As mentioned earlier,
this is activity is designed to get your cybersecurity thought processes started.
In Chapter 5, you will return to these scenarios and use what you have learned in Chapters 2, 3, and 4 to revise your
initial assessments. You will also compare your observations to those of professional security specialists who have
provided their observations and solutions for these scenarios.
Infrastructure Security Scenario 1
You are in charge of planning and implementing a security system for a new electrical substation that will be built
next to a new housing development. The substation is equipped with high-voltage electrical switching gear for the
surrounding community. It is not manned on a full-time basis but does have a control building that houses
instrumentation and communication equipment, as shown in Figure 1.1.
Transcribed Image Text: COMMUNICATION
345KV SHUNT
& CONTROL
EQUIPMENT INSIDE
REACTOR
345/115KV
TRANSFORMERS
DOOR
CONTROL
BUILDING
CONCRETE
WALL
GATE
14 FT
DOOR
LFIRE
WALL
40 FT
CHAIN LINK
FENCE
GATE
FIGURE 1.1 The Electrical Substation
The high-voltage switch gear accepts electrical power from different sources, which it then conditions and routes to
the community users as needed. The energy arrives on a set of different high-voltage supply lines and leaves the
facility via different sets of distribution lines.
The monitoring devices and control systems in the substation communicate with different parts of the utility's
transmission and distribution system to route electrical power where and when it is needed. These communication
channels include wireless radio signals, signals transmitted across the power lines, and traditional network
communications media.
Field of study that deals with the protection of computer systems and networks from information disclosure, theft, or damage to their hardware, software, or electronic data, as well as from the disruption or misdirection of the services they provide.
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What inventory of physical assets (devices and systems) can be created within the substation (NIST ID.AM-1)?