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Semester 2 final exam REVIEW

Semester 2 final exam REVIEW . 2011. CHAPTER 1. What is the speed of a T1 line? 1.544 Mbps What layer does PING test? Layer 3 What does PING send? AN ECHO REQUEST What does the time show when you issue a PING? THE TIME BETWEEN WHEN PACKET IS SENT AND RECEIVED. CHAPTER 1.

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Semester 2 final exam REVIEW

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  1. Semester 2 final exam REVIEW 2011

  2. CHAPTER 1 • What is the speed of a T1 line? • 1.544 Mbps • What layer does PING test? • Layer 3 • What does PING send? • AN ECHO REQUEST • What does the time show when you issue a PING? • THE TIME BETWEEN WHEN PACKET IS SENT AND RECEIVED

  3. CHAPTER 1 • PC1 pings the IP address of PC2. What does PC1 send by doing the PING? • An echo request message • PC2 responds to PC1 with what? • An echo reply message • What is the difference between PING and TRACERT? • Ping shows a reply from the device • Tracert shows the path it too

  4. CHAPTER 1 • What does the word “scalable” mean? • The ability to grow • What things are at Layer 1? • Hubs, transcievers, cables, waves, electrical issue

  5. CHAPTER 2 • What kind of cable is used to connect a switch to a switch? • A crossover • What kind of cable is used to connect a switch to a hub? • A crossover • What kind of cable is used to connect a switch to a router? • A straight through • What kind of cable is used to connect a computer directly to a to a router’s ethernet port? • A crossover

  6. CHAPTER 2 What kind of cable is used to connect a hub to a hub? A crossover What kind of cable is used to connect a switch to a pc’s ethernet port? A straight through What kind of cable is used to connect a computer’s comport a router in order to configure the router? A rollover (console cable)

  7. CHAPTER 2 You have a problem with a NIC. What layer is this? Layer 2 Which layer has to do with Firewalls? Layer 4 If you can HTTP to a site but you can’t FTP to the same site, what might be the problem? A misconfigured firewall

  8. CHAPTER 2 A customer calls and says they have a blank screen. What do you ask him? Is your computer plugged in/turned on Which level ISP help desk support would normally answer that problem? Level 1 Why do we use the OSI model? It divides networking communications into multiple processes that are smaller and more manageable

  9. CHAPTER 2 You are using a top-down troubleshooting approach to find problems. You assume it starts at what level? Layer 7 (application) What would you ask the customer to check first? Can they get to a website? A user can ping a host by IP address but not Domain name. What might be the problem? DNS

  10. CHAPTER 2 What are POP3 and SMTP? Email protocols Sending out a technician to the site to solve a problem that couldn’t be solved over the phone is a job of what level of ISP support personnel? Level 3 After going out to solve that problem, what should you do afterwards? Obtain acceptance fo the customer Document the solution

  11. CHAPTER 3 STP and UTP will travel how many feet? 328 feet or 100 meters What kind of cable do you need to used as a backbone between floors and greater and 500 meters? Fiber optic What kind of cable should be used between an MDF and an IDF? FIBER OPTIC

  12. CHAPTER 3 What is the cabling called going from the wall jack to a patch panel in a wiring closet? Horizontal cable You have been put in charge of designing a new structured cabling system for a company. What should you obtain first? An accurate floorplan

  13. CHAPTER 4 What is NAT and what does it do? Network Address Translation It hides your address from the rest of the world by using a private address inside the network What is PAT? Port Address Translation NAT overload What is the difference between the two? PAT allows you to have multiple computers using the same address on the outside world We learned about Static and Dynamic NAT. On what devices should you use Static Nat? File servers that need accessed from the outside world

  14. CHAPTER 4 What subnet mask will give you 62 computers in your network? 255.255.255.192 26 = 64 but you lose two so 62 computers With the subnet mask 255.255.255.224, how many computers? 25 = 32 but you lose two so 30 computers What subnet mask is /27? 255.255.255.224 25 = 32 meaning every subnet starts with a multiple of 32 192.168.65.0 192.168.65.32 192.168.65.64 192.168.65.96 etc

  15. CHAPTER 4 If you have a subnet mask of 255.255.254.0 how many computers do you have in subnetwork? 29 = 512 but you lose two so 510 computers With the above example, how many subnetworks will you have? 27 = 128 subnetworks Why would you get the message BAD MASK FOR ADDRESS 10.14.14.63 YOU GET THIS MESSAGE WHEN YOU TRY TO PUT A BROADCAST ADDRESS ON A INTERFACE

  16. CHAPTER 5 • WHAT IS AN SSID? • THE WIRELESS NETWORK THAT YOU ARE USING • WHY SHOULD YOU BROADCAST THE SSID? • SO YOUR USERS CAN FIND IT • WHY WOULD YOU NOT BROADCAST THE SSID? • WHEN YOU DON’T WANT USERS ON IT • WHY SHOULD YOU DO A WIRELESS SURVEY BEFORE YOU DEPLOY A NEW NETWORK? • IT WILL FIND THE OPTIMAL NUMBER AND PLACEMENT OF ACCESS POINTS

  17. CHAPTER 5 WHY IS DHCP USED? IT IS A SIMPLE WAY TOGET IP ADDRESSES TO HOSTS WHY WOULD YOU USE SERVICE PASSWORD-ENCRYPTION? TO ENCRYPT THE CONSOLE ACCESS PASSWORD DOE THE BANNER LOGIN COME AFTER THE MOTD (MESSAGE OF THE DAY) OR BEFORE? AFTER MOTD…BUT BEFORE THE LOGIN CREDENTIALS WHAT DOES A DEFAULT ROUTE POINT TO? THE NEXT HOP ROUTER ON THE PATH

  18. CHAPTER 5 • WHAT DOES THIS COMMAND DO? R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.0.2 • CREATES A DEFAULT ROUTE on R1 • WHAT COMMAND DO YOU NEED TO ENTER TO ENABLE AN INTERFACE? • NO SHUTDOWN • DO YOU HAVE TO HAVE A DESCRIPTION ON AN INTERFACE • NO----IT IS OPTIONAL

  19. CHAPTER 5 WHAT DOES ^ MEAN? WHERE YOU HAVE A MISTAKE THE COPY TFTP RUNNING-CONFIG WILL COPY FROM WHERE ? A TFTP SERVER WHERE DOES THAT SAME COMMAND COPY TO? RAM

  20. CHAPTER 5 WHEN USING IP NEGOTIATED WITH SDM, WHAT KIND OF ENCAPSULATION SUPPORTS AUTO IP ADDRESS ASSIGNMENT? PPP WHAT COLOR IS THE SYST LED LIGHT WHEN IT FAILS POST ? AMBER WHAT IS THE DEFAULT ENCAPSULATION ON SERIAL INTERFACES? HDLC

  21. CHAPTER 5 WHAT IS THE HOSTNAME COMMAND USED FOR? TO CHANGE THE NAME OF THE ROUTER IF YOU DO NOT HAVE THE COMMAND NO SHUTDOWN ENTERED, WILL THE INTERFACE BE ADMINISTRATIVELY UP OR DOWN ? DOWN, BUT THE IP WILL SHOW UP WHICH TYPE OF ROUTES ARE AUTOMATICALLY UPDATED AND MAINTAINED BY ROUTING PROTOCOLS? DYNAMIC

  22. CHAPTER 6 • WHAT DOES THE 120 MEAN IN 10.0.5.0[120/3] VIA 10.0.2.1, 00:00:10, SERIAL 0/2 • THE ADMINISTRATIVE DISTANCE • WHAT IS THE PURPOSE OF THE ROUTING PROCESS? • TO SELECT THE PATHS THAT ARE USED TO DIRECT TRAFFIC TO DESTINATION NETWORK • WHAT DOES 192.168.16.0 MEAN IN THE FOLLOWING R1(CONFIG)#IP ROUTE 192.168.16.0 255.255.255.0 192.168.15.1? • THE DESTINATION YOU ARE TRYING TO GET TO

  23. CHAPTER 6 • WHICH TYPE OF ROUTING PROTOCAL DEPENDS ON THE DUAL ALGORITHM TO CALCULATE THE SHORTEST PATH? • EIGRP • WILL EIGRP USE HOPS TO MAKE ITS DECISION ON WHICH ROUTE TO TAKE? • NO…IT MIGHT GO THROUGH MORE ROUTERS, IF THE PATH IS ACTUALLY FASTER • WHAT DOES EGP STAND FOR AND WHAT DOES IT DO? • EXTERIOR GATEWAY PROTOCOL AND IT ROUTES BETWEEN DIFFERENT AUTONOMOUS SYSTEMS • AN EXAMPLE WOULD BE BGP

  24. CHAPTER 6 • WHAT DOES AN R SIGNIFY IN A SHOW IP ROUTE? • RIP ROUTING IS USED • WHAT DOES THE SERIAL 0/0/0 MEAN IN THE FOLLOWING? • 192.168.4.0/24 [120/1] via 192.168.3.2, 00:00:19, serial 0/0/0 • THE ROUTER INTERFACE THAT 192.168.4.0 WILL SEND TO

  25. CHAPTER 7 • WE LEARNED ABOUT UDP AND TCP. WHICH ONE IS CONSIDERED TO BE CONNETIONLESS? • UDP • WHICH ONE USES MORE OVERHEAD? • TCP • WHICH ONE RETRANSMITS LOST PACKAGES? • TCP • WHICH ONE USES A THREE WAY HANDSHAKE AND SEQUENCE NUMBERS? • TCP

  26. CHAPTER 7 • WHAT IS DNS USED FOR? • TO RESOLVE HUMAN READABLE DOMAIN NAMES TO NUMERIC IP ADDRESSES • IT ALSO REPLACES THE STATIC HOSTS FILE WITH A MORE PRACTICAL DYNAMIC SYSTEM • WHAT IS THE DIFFERENCE BETWEEN HTTP AND HTTPS? • HTTPS ISSECURE • WHAT IS A CACHING ONLY DNS SERVER • ONE THAT RESOLVES MOST QUERIES MORE RAPIDLY

  27. CHAPTER 7 • HOW MANY CONNECTIONS NEED TO EXIST BEWTEEN THE CLIENT AND SERVER TO TRANSFER FILES USING FTP? • 2 ONE FOR DATA ONE FOR CONTROL INFORMATION • WHEN SENDING INFORMATION TO AN IP ADDRESS, WHAT DOES THE NUMBER AFTER THE COLON INDICATE IN THE EXAMPLE? 192.168.17.43:8547, 172.16.62.240:80 • THE PORT NUMBER THAT IS BEING USED • WHAT IS REVERSE LOOKUP DNS ZONE? • IT RESOLVES AN IP ADDRESS TO A FULLY QUALIFIED DOMAIN NAME • IS UDP FASTER THAN TCP? • YES IT IS, BECAUSE IT DOESN’T HAVE TO RETRANSMIT

  28. CHAPTER 8 • WHAT DOES “PRINCIPLE OF LEAST PRIVILEGE” MEAN? • ONLY GIVE ACCESS TO THE RESOURCES THAT ARE NECESSARY FOR THEIR JOB • WHAT IS THE MAIN GOAL OF AAA’S THREE STEP PROCESS? • TO PREVENT UNAUTHORIZED ACCESS TO A NETWORK • HOW IS IPS DIFFERENT FROM IDS? • IDS JUST NOTIFIES THERE MIGHT BE A PROBLEM, IPS STOPS IT FROM ENTERING INSIDE THE NETWORK

  29. CHAPTER 8 • WHAT IS A NORMAL BACK UP? • BACKS UP EVERYTHING, WHETHER IT CHANGED OR NOT • WHAT IS INCREMENTAL BACKUP? • BACKS UP ONLY THINGS THAT HAVE CHANGED THAT DAY…REQUIRES THE LONGEST RESTORE • WHAT IS DIFFERENTAL BACKUP? • COPIES ONLY THINGS THAT HAVE CHANGED SINCE THE LAST BACKUP

  30. CHAPTER 9 • IF YOU SUSPECT A NIC MIGHT BE THE SOURCE OF THE PROBLEM, WHAT LAYER IS THIS? • LAYER 2

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