📚 CompTIA A+ Tips - Chapitre 13 🔄 Revision

💡 A+ Exam Tips : Networking

Relis d'abord ces points que le livre lui-meme signale comme importants pour l'examen ("A+ Certification Exam Tips"). Puis reponds au QCM pour verifier que tu as vraiment compris de quoi il s'agit - pas juste memorise les mots.

  1. This chapter provides information related to both the 220-1201 and 220-1202 exams. The information related to the 1202 exam includes the Network and Sharing Center Control Panel, Network & Internet settings, and network client configuration (including IP addressing scheme, DNS settings, subnet mask, gateway, static and dynamic addressing, wired network connection, wireless, wireless WWAN [cellular], network-related commands - ipconfig, ifconfig, nslookup, tracert, netstat, net use, net user, pathping, and ping - NIC properties, network shares, and drive mapping). (p. 630)
  2. Know the difference between a LAN, WAN, PAN, MAN, SAN, WLAN and WWAN. (p. 630)
  3. Know the purposes of these network devices: hubs, routers, access points, firewalls, patch panels, cable/DSL modems, repeaters, PoE devices (injectors and switches), and switches (both managed and unmanaged). Also be able to describe how software-defined networking (SDN) uses software to handle functions normally provided in hardware by dividing a network into the control and data planes. (p. 630)
  4. Know the purposes of key networking protocols, port numbers used by the protocols, and the differences between TCP and UDP. (p. 630)
  5. Know when to use a particular type of networking tool, whether it is a physical tool or a command. Physical tools include crimpers, cable strippers, Wi-Fi analyzers, toner probes, punchdown tools, cable testers, loopback plugs, and network taps. (p. 630)
  6. Know what a VLAN is and how it is configured on a switch. (p. 630)
  7. Know what to do when one or more computers cannot connect to the internet or when computers have an IP address conflict. Know how to tell whether the problem is an internet connection problem and what specific network resources the device can't reach, such as network shares, printers, or email. (p. 631)
  8. Know how to manually configure an IP address on a network device such as a computer, an AP, or a printer. (p. 631)
  9. Know the different types of wireless networks and their compatibility with each other. (p. 631)
  10. Be able to configure a wireless network and 2.4 GHz and 5 GHz channels so multiple wireless APs can coexist as well as other parameters, such as an administrator password and DHCP. (p. 631)
  11. Know the purpose of an IP address, a default gateway, and a subnet mask. (p. 631)
  12. Know the difference between an IPv4 address and an IPv6 address. (p. 631)
  13. Recognize when an address is a private IP address and understand the difference between a public IP address and a private IP address. (p. 631)
  14. Be familiar with DHCP terminology, including leases, reservations, and scope. (p. 631)
  15. Know the different types of network cabling and connectors. (p. 631)
  16. Recognize when a computer gets assigned an IP address by APIPA. (p. 631)
  17. Know the port numbers and purposes of the following protocols as well as the differences between TCP and UDP: 20/21 (FTP), 22 (SSH), 23 (Telnet), 25 (SMTP), 53 (DNS), 67/68 (DHCP), 80 (HTTP), 110 (POP3), 143 (IMAP), 443 (HTTPS), 3389 (RDP), 137-139 (NetBIOS/NetBT), 161-162 (SNMP), 389 (LDAP), and 445 (SMB/CIFS). (p. 631)
  18. Know the purposes of different servers, including web, fileshare, database, print, DHCP, DNS, mail, NTP, syslog, and authentication (AAA) servers. (p. 631)
  19. Review the section on troubleshooting network printer problems. (p. 631)
  20. If a wireless laptop cannot get on a wireless network, you might have to forget the network, reconnect, and provide credentials. You can also check to see if wireless has been disabled. (p. 631)
  21. Be able to recognize and troubleshoot problems with IP addressing information that comes from a DHCP server (including IP address, exclusions, default gateway, subnet mask, and DNS server address). (p. 631)
  22. Be able to troubleshoot wireless problems by, for example, moving a device to a different location and making sure a wireless NIC is turned on. (p. 631)
  23. Be able to use the ipconfig command and review the options available (by using ipconfig /?). (p. 631)
  24. Be able to use the Network Status link to view or configure public or private networks, IP addressing information, and the MAC address of a NIC. (p. 631)
  25. Review the different DNS message types: A, AAAA, MX, CANME, and TXT. (p. 631)
  26. Know what might cause an authentication failure. (p. 631)
  27. Be able to describe the services provided by IoT devices and legacy/embedded systems like SCADA systems. (p. 631)

QCM tricky sur ces tips

Q1. According to the exam tips, information from this Networking chapter appears on:

Q2. A company wants a network dedicated to letting its backup storage systems communicate with each other at high speed - not for general user traffic. Which network type is this?

Q3. Which TWO of these network types can span multiple buildings or an entire city, rather than just one home or office?

Q4. Which network device works by broadcasting incoming data out every port except the one it arrived on?

Q5. In software-defined networking (SDN), which plane is responsible for actually forwarding/moving traffic, as opposed to building routing or MAC address tables?

Q6. Which of these protocols is connectionless and does not resend lost data, trading reliability for speed?

Q7. Which of these is a PHYSICAL network tool rather than a command-line tool?

Q8. What is the main purpose of putting different device types (IP phones, PCs, printers) into separate VLANs on the same physical switch?

Q9. Two computers on the network suddenly can't communicate properly, and Windows shows a message about a duplicate address. What is the likely cause?

Q10. Which of these devices would you most likely give a manually configured (static) IP address, rather than leaving it on DHCP?

Q11. Which 802.11 standard is NOT backward compatible with 802.11b, because it operates only in the 5 GHz range?

Q12. Which three 2.4 GHz channel numbers are recommended for nearby access points, since their frequency ranges don't overlap?

Q13. What is the purpose of a default gateway?

Q14. What is a key structural difference between an IPv4 address and an IPv6 address?

Q15. Which of these is a private IPv4 address?

Q16. A network admin wants a specific printer to always receive the exact same IP address from the DHCP server, without statically configuring the printer itself. What DHCP feature achieves this?

Q17. Which connector is used for Ethernet network cabling, as opposed to a telephone line?

Q18. A computer can ping other devices on its local network but not reach the internet, and ipconfig shows an address starting with 169.254. What is happening?

Q19. Which TWO of these protocol/port pairs are correctly matched?

Q20. Which port number is used by SSH, and what other protocol commonly shares that same port number?

Q21. Which server type would you check first if you needed to review a historical record of network events, like an interface repeatedly going down?

Q22. A network printer has stopped responding. After the normal local checks (power, paper, driver), what should you try next?

Q23. A wireless laptop that connected fine yesterday now cannot join the same network at all. Besides checking whether wireless is disabled, what should you try?

Q24. Which of the following is NOT something a DHCP server hands out to a requesting device?

Q25. A wireless device shows a weak, intermittent signal. Besides confirming the wireless NIC is turned on, what simple step often helps?