UNIT 7. DHCP, DNS and Disaster Recovery

Transcription

1 UI 7 H, and isaster ecovery onna arren

2 esigning a ampus etwork onna arren

3 etwork onfiguration in a ampus ore istribution ccess ore Backbone of the network ayer 3 switches and routers istribution point where the individual s connect together ccess where the networking devices in a connect together onna arren

4 electing the Media he choices for the media used to interconnect networks in a campus network are based on several criteria: esired data speed istance for connections Budget onna arren

5 dvantages of H ynamic Host onfiguration rotocol reduces the administrative workload and eliminates clerical errors llows administrators to easily change I configurations cales well to both small and enormous networks onna arren

6 H ervice ynamically assigns an I address to requesting machines I addresses are leased scope of addresses can be assigned or excluded from assignment H servers do not talk to each other ll machines except the H server can be assigned I ddresses dynamically. onna arren

7 H ease rocess lient broadcast a lease request lient H iscover erver H server responds and offers an I address lient H ffer erver onna arren

8 H ease rocess lient broadcasts an acceptance message lient H equest erver H server acknowledges the lease assignment H lient erver hese are the only two frames required to renew an address onna arren

9 1. acket 10 is a H request with a H-iscover packet. he destination for the packet is a broadcast. he message source has a M address of ell 09B956 and the I address is acket 13 is a reply from the H server with a H-ffer packet this is an offer of fthe I address to the client. 3. acket 15 is a message type of. he H server is acknowledging the client s acceptance of the I address from the H server. he client computer now has an I address assigned to it. onna arren

10 H ease enewal he default lease period is 8 days H client will send a lease renewal request to the issuing H server to renew it s lease after 50% of the lease period expires If no response is received after 87.5% of the lease has expired, the client will broadcast to any H server for lease renewal ipconfig / renew - utility to allow a user to request a lease renewal ipconfig / release - utility to allow a user to request a lease be terminated onna arren

11 ipconfig Utility c:\>ipconfig /all indows I onfiguration Host ame : dpw-dell rimary ns uffix : ode ype : Unknown I outing nabled : o I roxy nabled : o thernet adapter ocal rea onnection: onnection-specific uffix. : escription..... : Broadcom etxtreme 57xx Gigabit ontroller hysical ddress : hcp nabled : Yes utoconfiguration nabled.. : Yes I ddress : ubnet Mask : efault Gateway : H erver : ervers : ease btained : Monday, ctober 19, :44:28 M ease xpires : uesday, ctober 20, :44:28 M onna arren

12 (omain ame ervice) esolves FQ (fully qualified domain names to I addresses tatic atabase using host names (UIX and internet convention) ames stored in in a text t file can be configured to use I etbi name resolution rovide reverse lookup services Has sophisticated caching techniques onna arren

13 ample I netadmin.itt-tech.edu. dpw.itt- tech.edu ; name netadmin.itt.tech.edu itt tech edu I netadmin.itt-tech.edu ; aliases eacher I M netadmin ; mail I MX 10 mail1 I ;I I I onna arren

14 nslookup utility command line utility that allows troubleshooting for servers yntax :\> nslookup microsoft.comcom erver: ns02.plnfld01.nj.comcast.net ddress: on-uthorative answer ame: microsoft.com ddresses: onna arren

15 isaster ecovery lanning onna arren

16 hy Bother? he world trade center bombing in 1993 caused 150 of the 350 business located in the center to go out of business 42% could not recover from the downtime 43% of businesses never reopen after a major fire nother 35% of the fire victims will end up closing within 3 years onna arren

17 xisting ituation 60% of small business do not have a backup power supply 90% of small businesses do not have a disaster recovery plan 95% data loss is at the local l site because 39% have no regular backup process 80% do not have off-site data storage onna arren

18 auses of owntime Failures 45% - application failure 25% - human error 30 % - technical network failure including both hardware and software onna arren

19 Business ontinuity lanning Business continuity and disaster ecovery lanning is all about preparedness in case something happens It covers how you can continue servicing your clients when failure or disaster strikes Includes what to do before, during and after the disaster strikes onna arren

20 isaster ecovery overs how an organization recover its assets after a major interruption from atural disaster echnical isaster Human isaster onna arren

21 atural isasters ccount for only 2% of all downtime xamples Hurricanes, floods, tornadoes, earthquakes, ice storms, blizzards, wind storms and brush fires ocation determines which type of natural disaster is most likely to occur onna arren

22 echnical isasters ccount for 70% of all downtime xamples Hardware failure Backup failures ater damage Fires ower outages etwork cable cut ata breaches oftware failures onna arren

23 Human isasters ccount for 25% of all downtime xamples isgruntled employee oops events atches and upgrades Viruses and malware onfiguration errors onna arren

24 hat oes owntime ost? hat would it cost if: Your servers were stolen ll systems down annot recover your data ccount information lient list ebsite unavailable mail down onna arren

25 ocation hysically estroyed Getting necessary equipment up and running ecovering essential data eestablishing communications with both employees and customers esuming business operation must know how the business process actually flows onna arren

26 ata estroyed How to replace Hardware hat to due when there is a software failure lan to remove viruses or other malware How to recover data stolen or corrupted by a hacker How to recover from human error onna arren

27 Questions to sk hat level of service should be maintained during a disaster? How will the org. communicate internally? here will help desks and command centers be located? re policies and procedures res in place to handle customer and other incoming calls in a professional manner and to provide timely information? onna arren

28 Questions to sk re computers and their data sufficiently backed up? hat happens in the event of an evacution? hat is the sequence for recovery? hich departments must be put back in operation first, second, etc. re procedures in place for regular testing of the disaster recovery plan? onna arren

29 he isaster ecovery lan revention Measures ervers in a secure and climate controlled area with no overhead sprinklers? oing daily backups and using off-site storage for weekly backups esting the backups? Good technical and business documentation? Good anti-virus protection? rained I staff? onna arren

30 ocumentation eeded ist what is critical to the business rder to restore systems and step by step instructions ist of serial numbers and activation keys ist of hardware make and model and what applications and data are on each machine etwork and wiring diagram clearly labeled ist of vendors, staff, power company, plumbers, electricians, etc contact information onna arren

31 Implementation reate the plan ine up the necessary resources rain the staff est the plan onna arren

32 atch Movie onna arren