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CCNA RS_ITN - Chapter 11
1.
Chapter 11: It’s
a Network Introduction to Networking © 2008 Cisco Systems, Inc. All Presentation_ID rights reserved. Cisco Confidential 1
2.
Chapter 11 11.1
Create and Grow 11.2 Keeping the Network Safe 11.3 Basic Network Performance 11.4 Managing IOS Configuration Files 11.5 Integrated Routing Services 11.6 Summary Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2
3.
Chapter 11: Objectives
Identify the devices and protocols used in a small network Explain how a small network serves as the basis of larger networks. Explain the need for basic security measures on network devices. Identify security vulnerabilities and general mitigation techniques Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 3
4.
Chapter 11: Objectives
(continued) Use the output of ping and tracert commands to establish relative network performance. Use basic show commands to verify the configuration and status of a device interface. Explain the file systems on Routers and Switches. Apply the commands to back up and restore an IOS configuration file. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 4
5.
Devices in a
Small Network Small Network Topologies Typical Small Network Topology Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 5
6.
Devices in a
Small Network Device Selection for a Small Network Factors to be considered when selecting intermediate devices Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 6
7.
Devices in a
Small Network Addressing for a Small Network IP addressing scheme should be planned, documented and maintained based on the type of devices receiving the address. Examples of devices that will be part of the IP design: End devices for users Servers and peripherals Hosts that are accessible from the Internet Intermediary devices Planned IP schemes help the administrator: Track devices and troubleshoot Control access to resources Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 7
8.
Devices in a
Small Network Redundancy in a Small Network Redundancy helps to eliminate single points of failure. Improves the reliability of the network. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 8
9.
Devices in a
Small Network Design Considerations for a Small Network The following should be included in the network design: Secure file and mail servers in a centralized location. Protect the location by physical and logical security measures. Create redundancy in the server farm. Configure redundant paths to the servers. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 9
10.
Protocols in a
Small Network Common Applications in a Small Network Network-Aware Applications - software programs used to communicate over the network. Application Layer Services - programs that interface with the network and prepare the data for transfer. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 10
11.
Protocols in a
Small Network Common Protocols in a Small Network Network Protocols Define: Processes on either end of a communication session Types of messages Syntax of the messages Meaning of informational fields How messages are sent and the expected response Interaction with the next lower layer Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 11
12.
Protocols in a
Small Network Real-Time Applications for a Small Network Infrastructure - needs to be evaluated to ensure it will support proposed real time applications. VoIP is implemented in organizations that still use traditional telephones IP telephony - the IP phone itself performs voice-to-IP conversion Real-time Video Protocols - Use Time Transport Protocol (RTP) and Real-Time Transport Control Protocol (RTCP) Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 12
13.
Growing to Larger
Networks Scaling a Small Network Important considerations when growing to a larger network: Documentation – physical and logical topology Device inventory – list of devices that use or comprise the network Budget – itemized IT budget, including fiscal year equipment purchasing budget Traffic Analysis – protocols, applications, and services and their respective traffic requirements should be documented Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 13
14.
Growing to Larger
Networks Protocol Analysis of a Small Network Information gathered by protocol analysis can be used to make decisions on how to manage traffic more efficiently. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 14
15.
Growing to Larger
Networks Evolving Protocol Requirements Network administrator can obtain IT “snapshots” of employee application utilization. Snapshots track network utilization and traffic flow requirements. Snapshots help inform network modifications needed. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 15
16.
Network Device Security
Measures Threats to Network Security Categories of Threats to Network Security Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 16
17.
Network Device Security
Measures Physical Security Four classes of physical threats are: Hardware threats - physical damage to servers, routers, switches, cabling plant, and workstations. Environmental threats - temperature extremes (too hot or too cold) or humidity extremes (too wet or too dry) Electrical threats - voltage spikes, insufficient supply voltage (brownouts), unconditioned power (noise), and total power loss Maintenance threats - poor handling of key electrical components (electrostatic discharge), lack of critical spare parts, poor cabling, and poor labeling Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 17
18.
Network Device Security
Measures Types of Security Vulnerabilities Technological weaknesses Configuration weaknesses Security policy weaknesses Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 18
19.
Vulnerabilities and Network
Attacks Viruses, Worms and Trojan Horses A virus - malicious software that is attached to another program to execute a particular unwanted function on a workstation. A Trojan horse - the entire application was written to look like something else, when in fact it is an attack tool. Worms - self-contained programs that attack a system and try to exploit a specific vulnerability in the target. The worm copies its program from the attacking host to the newly exploited system to begin the cycle again. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 19
20.
Vulnerabilities and Network
Attacks Reconnaissance Attacks Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 20
21.
Vulnerabilities and Network
Attacks Access Attacks Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 21
22.
Vulnerabilities and Network
Attacks Denial of Service Attacks (DoS) Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 22
23.
Mitigating Network Attacks
Backup, Upgrade, Update, and Patch Keep current with the latest versions of antivirus software. Install updated security patches Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 23
24.
Mitigating Network Attacks
Authentication, Authorization, and Accounting Authentication, Authorization, and Accounting (AAA, or “triple A”) Authentication - Users and administrators must prove their identity. Authentication can be established using username and password combinations, challenge and response questions, token cards, and other methods. Authorization - which resources the user can access and which operations the user is allowed to perform. Accounting - records what the user accessed, the amount of time the resource is accessed, and any changes made. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 24
25.
Mitigating Network Attacks
Firewalls A firewall resides between two or more networks. It controls traffic and helps prevent unauthorized access. Methods used are: Packet Filtering Application Filtering URL Filtering Stateful Packet Inspection (SPI) - Incoming packets must be legitimate responses to requests from internal hosts. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 25
26.
Mitigating Network Attacks
Endpoint Security Common endpoints are laptops, desktops, servers, smart phones, and tablets. Employees must follow the companies documented security policies to secure their devices. Policies often include the use of anti-virus software and host intrusion prevention. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 26
27.
Securing Devices Introduction
to Securing Devices Part of network security is securing devices, including end devices and intermediate devices. Default usernames and passwords should be changed immediately. Access to system resources should be restricted to only the individuals that are authorized to use those resources. Any unnecessary services and applications should be turned off and uninstalled, when possible. Update with security patches as they become available. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 27
28.
Securing Devices Passwords
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 28
29.
Securing Devices Basic
Security Practices Encrypt passwords Require minimum length passwords Block brute force attacks Use Banner Message Set EXEC timeout Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 29
30.
Securing Devices Enable
SSH Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 30
31.
Ping Interpreting ICMP
Messages ! - indicates receipt of an ICMP echo reply message . - indicates a time expired while waiting for an ICMP echo reply message U - an ICMP unreachable message was received Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 31
32.
Ping Leveraging Extended
Ping The Cisco IOS offers an "extended" mode of the ping command R2# ping Protocol [ip]: Target IP address: 192.168.10.1 Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: 10.1.1.1 Type of service [0]: Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 32
33.
Ping Network Baseline
Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 33
34.
Tracert Interpreting Tracert
Messages Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 34
35.
Show Commands Common
Show Commands Revisited The status of nearly every process or function of the router can be displayed using a show command. Frequently used show commands: show running-config show interfaces show arp show ip route show protocols show version Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 35
36.
Show Commands Viewing
Router Settings with Show Version Cisco IOS version System bootstrap Cisco IOS image CPU and RAM Number and type of physical interfaces Amount of NVRAM Amount of Flash Config. register Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 36
37.
Show Commands Viewing
Switch Settings with Show Version Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 37
38.
Host and IOS
Commands ipconfig Command Options ipconfig - displays ip address, subnet mask, default gateway. ipconfig /all – also displays MAC address. Ipconfig /displaydns - displays all cached dns entries in a Windows system . Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 38
39.
Host and IOS
Commands arp Command Options Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 39
40.
Host and IOS
Commands show cdp neighbors Command Options Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 40
41.
Host and IOS
Commands Using show ip interface brief Command Can be used to verify the status of all network interfaces on a router or a switch. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 41
42.
Router and Switch
File Systems Router File Systems show file systems command - lists all of the available file systems on a Cisco 1941 route * Asterisk indicates this is the current default file system Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 42
43.
Router and Switch
File Systems Switch File Systems show file systems command - lists all of the available file systems on a Catalyst 2960 switch. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 43
44.
Backup and Restore
Configuration Files Backup and Restore using Text Files Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 44
45.
Backup and Restore
Configuration Files Backup and Restore using TFTP Configuration files can be stored on a Trivial File Transfer Protocol (TFTP) server. copy running-config tftp – save running configuration to a tftp server copy startup-config tftp - save startup configuration to a tftp server Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 45
46.
Backup and Restore
Configuration Files Using USB Interfaces on a Cisco Router USB flash drive must be formatted in a FAT16 format. Can hold multiple copies of the Cisco IOS and multiple router configurations. Allows administrator to easily move configurations from router to router. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 46
47.
Backup and Restore
Configuration Files Backup and Restore Using USB Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 47
48.
Integrated Router Multi-function
Device Incorporates a switch, router, and wireless access point. Provides routing, switching and wireless connectivity. Linksys wireless routers, are simple in design and used in home networks Cisco Integrated Services Router (ISR) product family offers a wide range of products, designed for small office to larger networks. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 48
49.
Integrated Router Wireless
Capability Wireless Mode -Most integrated wireless routers support 802.11b, 802.11g and 802.11n Service Set Identifier (SSID) - Case-sensitive, alpha-numeric name for your home wireless network. Wireless Channel – RF spectrum divided up into channels. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 49
50.
Integrated Router Basic
Security of Wireless Change default values Disable SSID broadcasting Configure Encryption using WEP or WPA Wired Equivalency Protocol (WEP) - uses pre-configured keys to encrypt and decrypt data. Every wireless device allowed to access the network must have the same WEP key entered. Wi-Fi Protected Access (WPA) – also uses encryption keys from 64 bits up to 256 bits. New keys are generated each time a connection is established with the AP. Therefore more secure. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 50
51.
Integrated Router Configuring
the Integrated Router Access the router by cabling a computer to one of the router’s LAN Ethernet ports. The connecting device will automatically obtain IP addressing information from Integrated Router Change default username and password and the default Linksys IP address for security purposes. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 51
52.
Integrated Router Enabling
Wireless Configure the wireless mode Configure the SSID Configure RF channel Configure any desired security encryption Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 52
53.
Integrated Router Configure
a Wireless Client The wireless client configuration settings must match that of the wireless router. SSID Security Settings Channel Wireless client software can be integrated into the device operating system or stand alone, downloadable, wireless utility software. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 53
54.
Chapter 11: Summary
Good network design incorporates reliability, scalability, and availability. Networks must be secured from viruses, Trojan horses, worms and network attacks. Document Basic Network Performance. Test network connectivity using ping and traceroute. Use IOS commands to monitor and view information about the network and network devices. Backup configuration files using TFTP or USB. Home networks and small business often use integrated routers, which provide the functions of a switch, router and wireless access point. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 54
55.
Presentation_ID © 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential 55