lpic 1 linux professional institute certification study guide

... g 152 Trang 10■ CONTENTS Now Try This 155 Test Yourself 155 Answer Key 157 ■ Appendix: LPIC-1 Exam Objectives 159 LPIC-1 Exam 101 159 Topic 101: System Architecture 159 Topic 102: Linux ... Chapter 10: Topic 110: Security 141 System Security 141 Host Security 146 Encryption: Securing Data in Transit 148 OpenSSH 149 Passwordless Access 150 Using ssh-agent 151 X11 Tunnels 152 ... 112 System Logging 114 Using syslogd 114 Using journald 116 Using logger 116 Using logrotate 117 Mail Transfer Agent Basics 118 Manage Printers and Printing 120 Trang 9Now Try This 122Test

Ngày tải lên: 14/05/2018, 15:10

... g 152 Trang 10■ CONTENTS Now Try This 155 Test Yourself 155 Answer Key 157 ■ Appendix: LPIC-1 Exam Objectives 159 LPIC-1 Exam 101 159 Topic 101: System Architecture 159 Topic 102: Linux ... Chapter 10: Topic 110: Security 141 System Security 141 Host Security 146 Encryption: Securing Data in Transit 148 OpenSSH 149 Passwordless Access 150 Using ssh-agent 151 X11 Tunnels 152 ... Internationalization 106 Now Try This 109 Test Yourself 109 Answer Key 110 ■ Chapter 8: Topic 108: Essential System Services 111 Maintain System Time 111 The Hardware Clock 111 Network Time Protocol

Ngày tải lên: 04/11/2019, 07:47

... Trang 2CompTIA Network+ Certification Study Guide Trang 3This page intentionally left blankTrang 4CompTIA Network+ Certification Study Guide Exam N10-004 2E Robert J Shimonski Technical ... CompTIA Network+ certification study guide / Robert J Shimonski [et al.] — 2nd ed p cm Includes index ISBN 978-1-59749-429-8 (pbk : alk paper) 1 Computer networks—Examinations—Study guides 2 Electronic ... 01803 CompTIA Network+ Certification Study Guide Copyright © 2009 by Elsevier, Inc All rights reserved Printed in the United States of America Except as permitted under the Copyright Act of 1976,

Ngày tải lên: 04/07/2014, 13:20

... Fenner, Andrew M Rudoff, Prentice Hall, ISBN 0131411551 n UNIX Network Programming: Interprocess Communications,W Richard Stevens, Prentice Hall, ISBN 0130810819 Individual network protocols are normally ... someone else to use Use fclose()to close your socket: <?php // Chapter 10: Stream and Network Programming // // Example 11: Using fclose() // here, we create a stream using fsockopen(), and then ... late W Richard Stevens n UNIX Network Programming Volume 1: Networking APIs—Sockets and XTI,W. Richard Stevens, Prentice Hall, ISBN 013490012X n UNIX Network Programming:The Sockets Networking API,W

Ngày tải lên: 20/10/2013, 14:15

... spans a large number of characters: $db->query(“select foo, bar, mybar as foobar from tbl1 where tbl1.mybar=’foo’”); This database query is split over several lines.The main advantage here is ... PHP configuration directives Thus, the following <?php print “Testing 1 2 3” ?> is longer than <?= “Testing 1 2 3” ?> But not quite as portable Note, also, that there is a subtle ... resources without ensuring that they are available For example, look at the following code: Trang 8191 Ternary Operators and if Statements $res = mysql_query(“select foo from bar”); while ($row =

Ngày tải lên: 24/10/2013, 12:15

... channels, 112 concept of, 111 devices, 113 history of, 110–112 identifiers, 114–115 interfaces, 112–113 reference points, 113–114 Intelligent hubs, 582 Interface network layer, 258–261 Interior ... 199, 461 user identification and strong authentication, 199, 461 802.3 standard, 185 802.11 standard, 185, 187–190 802.11a, 188 802.11b, 187–188 802.11g, 189 802.11n, 189 authentication in, 195–200 ... Supernetting, 308, 311 Switched port analyzer (SPAN), 160 Index 775 Switches, 151 basic, 154–155, 162 content, 156–157, 163 in data link layer, 249 features, 157–161, 163–164 multilayer, 155–156, 163 multiport

Ngày tải lên: 04/07/2014, 13:20

... 978-1-931836-57-9, Syngress), the technical editor for Security+ Study Guide and DVD Training System, (ISBN: 978-1-931836-72-2, Syngress), lead author and technical editor for Network+ Study Guide ... Building Enterprise DMZs (ISBN: 1597491004), Configuring Juniper Net-works NetScreen & SSG Firewalls (ISBN: 1597491187), How to Cheat at Securing Linux (ISBN: 1597492078), How to Cheat at Administering ... Security Professionals, (ISBN: 978-1-59749-139-6), a contributing author to The Real MCTS/MCITP Configuring Microsoft Windows Vista Client Exam 70-620 Prep Kit, (ISBN: 978-1-59749-233-1, Syngress),

Ngày tải lên: 04/07/2014, 13:20

... name, inclusive to the Pentium 75 (in 1994), Pentium 120, 133, and Pentium Pro 200 (in 1995), Pentium MMX and Pentium II (in 1997), and Pentium III (in 1999) As you would expect, each generation ... 8-/16-bit processor) is released in 1979 It isn’t until 1983 that IBM releases the XT with the 8086 processor (and option to add an 8087 math co-processor) 80286 (16-bit processor) produced in 1982 ... resides in the Smithsonian Institute Although UNIVAC was the more successful computer of its day, 1953 saw IBM release the EDPM 701 Using punch cards for programs, 19 of these were sold (as opposed

Ngày tải lên: 04/07/2014, 13:20

... that Company XYZ has offices in Boston and Phoenix. As shown in Figure 1.1, both offices connect to the Internet via a T1 con- nection. They have implemented VPN-capable firewalls in both offices ... responsible for FIGURE 1.1 A Site-to-Site VPN Established between Two Remote Offices. NOTES FROM THE FIELD… Issues with Site-to-Site VPNs A common mistake that network security professionals make ... CHAPTER 1: Network Fundamentals 16 can save their work to a dedicated server in a central location. This would keep

Ngày tải lên: 04/07/2014, 13:20

... speeds, up to 128 kbps but averaging at 64 kbps using an ISDN modem or router Digital Subscriber Line (DSL), which sends data across telephone ■ ■ lines at speeds ranging from 1.5 Mbps (1.5 million ... of up to 1.5 Mbps Satellite, which transmits data to a satellite at speeds of up to ■ ■ 400 Kbps T1 and T3, which are dedicated connections that provide extremely ■ ■ high speeds A T1 line provides ... uncon-nected ends to the ring, so terminators aren’t required Data passes around FIGurE 1.5 A Mesh Topology. FIGurE 1.6 A Ring Topology Has All Computers Connected with a Cable That Loops Around.

Ngày tải lên: 04/07/2014, 13:20

... card C T-Connector D Hub SElF TEST quICK ANSwEr KEy B 1 C 2 A 3 A 4 B 5 B 6 C 7 C 8 C 9 A and D 10 A 11 D 12 C 13 C 14 D 15 Trang 10ExAM oBJECTIvES IN ThIS ChApTEr INTroduCTIoN In ... and decide to 14 explain the topology of the existing network, shown in the Figure 1.9 What topology is currently being used? A Bus B Star C Mesh D Ring FIGurE 1.9 Trang 9ChApTEr 1: Network Fundamentals ... topology shown in 11 Figure 1.8 In looking at the physical layout of your network, which of the following types of topologies is being used? A Bus B Star C Mesh D Ring FIGurE 1.8 Trang 8You receive

Ngày tải lên: 04/07/2014, 13:20

... higher) 100 Mbps 10BaseFL Fiber-optic 10 Mbps 100BaseFX Fiber-optic 100 Mbps 1000BaseT UTP or STP (Category 5 or higher) 1 Gbps (1000 Mbps) 1000BaseSX Fiber-optic 1 Gbps (1000 Mbps) 1000BaseLX ... 1000BaseLX Fiber-optic 1 Gbps (1000 Mbps) 1000BaseCX Fiber-optic 1 Gbps (1000 Mbps) 10GbaseSR Fiber-optic 10 Gbps 10GbaseLX4 Fiber-optic 10 Gbps 10GbaseLR Fiber-optic 10 Gbps CHAPTER 2: Network ... Maximum Length 10Base2 Coax 185 m 10Base5 Coax 500 m 10BaseT UTP or STP (Category 3 or higher) 100 m 100BaseTX UTP or STP (Category 5 or higher) 100 m 10BaseFL Fiber-optic 2 km 100BaseFX Fiber-optic

Ngày tải lên: 04/07/2014, 13:20

... 10BaseT UTP (Category 3 or higher) 10 Mbps 100 m 100BaseTX UTP (Category 5 or higher) 100 Mbps 100 m or 2 km (full-duplex) 1000BaseT UTP (Category 5 or higher) 1 Gbps (1000 Mbps) 100 meters 1000BaseSX ... 1000BaseSX Fiber-optic 1 Gbps (1000 Mbps) 550 m (MMF) 1000BaseLX Fibe-optic 1 Gbps (1000 Mbps) 550 m (MMF) or up to 10 km (SMF) 1000BaseCX Fiber-optic 1 Gbps (1000 Mbps) 100 m Exam warning For ... block to another, generally 25-pair cable. Trang 4110 BlockWhen you want to terminate your connections you will want to connect to a 110 block The 110 block is used (primarily) with data connections

Ngày tải lên: 04/07/2014, 13:20

... variations of RJ con- nectors available. rJ-11 RJ-11 connectors are used on twisted- pair cables that are used by tele- phones. You can easily find an RJ-11 connector in your home by looking at ... Ethernet, and Token Ring. CAT 5 100 Mbps (4 pairs). Typically used for Ethernet networks running at 10 or 100 Mbps. Used for data and voice transmission; rated at 100 MHz; suitable for Ethernet, ... in ISO/IEC 11801. CAT 7 Not official standard at time of this writing. Still in development. Rated at 600 MHz; suitable for Ethernet, Fast Ethernet, Gigabit Ethernet, Token Ring, and 155 Mbps

Ngày tải lên: 04/07/2014, 13:21

... while 10BaseT, 100BaseTX, and 1000BaseT use UTP cabling Finally, we also discussed various standards used for fiber-optic networks, including 10BaseFL, 100BaseFX, 100BaseSX, 1000BaseLX, and 1000BaseCX ... Standards10Base2 uses coaxial cabling to transmit data at speeds of 10 Mbps ■ ■ across cable segments that are up to 185 m in length 10Base5 uses coaxial cabling to transmit data at speeds of 10 Mbps ... Thinnet is thin coaxial cable (about 1/4 inch thick) used on 10Base2 networks, while RG-59 cabling or Thicknet is thick coaxial cable (about 1/2 inch thick) used on 10Base5 networks Fiber-optic cabling

Ngày tải lên: 04/07/2014, 13:21

... 3ChApTEr 2: Network Media 98 SElF TEST quICK ANSwEr KEy B 1 A 2 B 3 D 4 B 5 B 6 D 7 C 8 C 9 A 10 C 11 B 12 C 13 C 14 D 15 Trang 4ChApTEr 3 ExAM oBJECTIvES IN ThIS ChApTEr INTroduCTIoN ... only two pairs of a Category 5 UTP cable A 10BaseT B 100BaseFL C 100BaseTX D 100BroadT4 You work as a network technician for 123 LLC You need to check 15 the electrical signals being sent from ... in such a network? (Choose one.) FIGurE 2.13 Trang 2Self Test 97A RJ-11 B RG 58 C SC D BNC As a Network technician for 123 LLC, you are asked by your 12 CIO about the access method of Gigabit

Ngày tải lên: 04/07/2014, 13:21

... line (ADSL) Downstream: 1.544 to 6.1 Mbps upstream: 16 to 640 Kbps Speeds decrease over distance 1.544 Mbps at 18,000 feet, 2.048 Mbps at 16,000 feet, 6.312 Mbps at 12,000 feet, and 8.448 Mbps ... list shows the implementations: H0 384 Kbps (6 B channels) ■ ■ H10 1472 Kbps (23 B channels) ■ ■ H11 1536 Kbps (24 B channels) ■ ■ H12 1920 Kbps (30 B channels) – Europe ■ ■ IsDN Interfaces Although ... 1 Mbps upstream: under 1 Mbps 18,000 feet DSL lite or G lite 1.544 to 6 Mbps 18,000 feet ISDN digital subscriber High digital subscriber line (HDSL) Varies depending on twisted pair lines 1.544

Ngày tải lên: 04/07/2014, 13:21

... you rented two channels on a T1 line, you would have a 128 Kbps connection When only a portion of the T1 line is used, it is referred to as fractional T1 If more than 1.544 Mbps of bandwidth was ... speeds depending on the level used A T1 line con-sists of 24 separate channels called DS0s that are 64 Kbps each In total, this equals 1.544 Mbps for a full T1 line Because some companies may not ... very much the same If you have a T1, for example, and you need to break that 1.544 Mbps of bandwidth down to smaller amount, you can do so with a fractional T1. What about the rest of that bandwidth,

Ngày tải lên: 04/07/2014, 13:21

... File server Trang 4Self Test Quick Answer Key 169SElF TEST quICK ANSwEr KEy A 1 B 2 D 3 B 4 B 5 D 6 B 7 A 8 A 9 D 10 A 11 C 12 A 13 D 14 B 15 Trang 5This page intentionally left blankTrang ... distance that data can travel along the cable A computer wants to send data to another computer on the 11 network Before it can send the data, it must send its credentials to a server that verifies ... Trang 1ChApTEr 4: Switching 166 C Install a bridge to break the larger LAN into two smaller ones, and then connect

Ngày tải lên: 04/07/2014, 13:21

... America allows 11 channels operating in the 2.4 to 2.4835 GHz range, Europe allows 13, and Japan allows 1 Because each channel is 22 MHz wide, the channels may overlap each other Of the 11 available ... frequency range employed by 802.11b, DSSS transmissions can be broadcast in any one of fourteen 22 MHz-wide channels The number of center-channel fre-quencies used by 802.11 DSSS devices depends on ... networks, wireless networks defined by the 802.11 standard do not use CSMA/CD as a method to protect against data loss resulting from collisions Instead, 802.11 networks use a method known as CSMA/CA

Ngày tải lên: 04/07/2014, 13:21