IT Essentials 8.0 Module 6.3.1.2 Applied Networking Quiz Answers
1. What command can be used to troubleshoot domain name resolution issues?
- get
- arp -a
- tracert
- nslookup
2. A technician wishes to update the NIC driver for a computer. What is the best location for finding new drivers for the NIC?
- the installation media that came with the NIC
- Windows Update
- the website for the manufacturer of the NIC
- the installation media for Windows
- the website for Microsoft
3. A computer is assigned an IP address of 169.254.33.16. What can be said about the computer, based on the assigned address?
- It cannot communicate outside its own network.
- It can communicate on the local network as well as on the Internet.
- It can communicate with networks inside a particular company with subnets.
- It has a public IP address that has been translated to a private IP address.
Explanation: If a computer is configured with DHCP but it cannot communicate with the DHCP server in order to obtain an IP address, the Windows OS automatically assigns a link-local IP, in the range of 169.254.0.0 to 169.254.255.255. The computer can only communicate with other computers connected to the same 169.254.0.0/16 network and cannot communicate with computers in another network.
4. A customer has a web server for a small business. The business uses both wired and wireless networking. A Linksys WRT300N wireless router provides wireless and wired connectivity. What firewall option may be enabled in order for customers to gain access to the web server from their remote locations?
- WEP
- WPA2
- port triggering
- port forwarding
- MAC address filtering
Explanation: Port forwarding directs traffic between networks using forwarding rules. WPA encrypts wireless information, and MAC filtering prevents unauthorized access to the WLAN. Port triggering is a technique used with NAT configurations.
5. Which protocol dynamically assigns IP addresses to network devices?
- DHCP
- DNS
- ICMP
- RARP
- TCP
6. Which protocol is used by ping to test connectivity between network hosts?
- ARP
- DHCP
- TCP
- ICMP
Explanation: The Internet Control Message Protocol (ICMP) is used by ping to test connectivity between network hosts. The Address Resolution Protocol (ARP) is used to map IP addresses to MAC addresses. The Dynamic Host Configuration Protocol (DHCP) is used to dynamically assign IP addresses to network hosts. The Transmission Control Protocol (TCP) is considered a reliable protocol that segments the application layer data into segments for transmission.
7. A wireless router is displaying the IP address of 192.168.0.1. What could this mean?
- The NAT function is not working on the wireless router.
- The wireless router still has the factory default IP address.
- Dynamic IP address allocation has been configured on the router and is functioning correctly.
- The wireless router has been configured to use the frequencies on channel 1.
8. What is the problem if a computer automatically configures an IP address in the 169.254.x.x address range?
- The DHCP server is unreachable.
- The DNS server is unreachable.
- The computer NIC is disabled.
- The computer is configured with an incorrect default gateway.
Explanation: When a computer automatically configures an IP address in the 169.254.x.x range, then it is an indication that the DHCP is inaccessible or down.
9. A user reports that the corporate web server cannot be accessed. A technician verifies that the web server can be accessed by its IP address. What are two possible causes of the problem? (Choose two.)
- The network connection is down.
- The web server is misconfigured.
- The DNS server address is misconfigured on the workstation.
- The web server information is misconfigured on the DNS server.
- The default gateway address is misconfigured on the workstation.
Explanation: The fact that the web server can be accessed by its IP address indicates that the web server is working and there is connectivity between the workstation and the web server. However, the web server domain name is not resolving correctly to its IP address. This could be caused by a misconfiguration of the DNS server IP address on the workstation or the wrong entry of the web server in the DNS server.
10. A new computer workstation has been installed in a small office. The user of the workstation can print a document using a network printer on the LAN, but cannot access the Internet. What is a possible cause of the problem?
- The TCP/IP stack is not functional.
- The gateway IP address is misconfigured.
- The DHCP server IP address is misconfigured.
- The workstation is configured with a static IP address.
Explanation: The fact that the workstation can print at a networked printer indicates that the TCP/IP stack is functional. However, that the workstation cannot communicate with external networks indicates that the most likely problem is the incorrect default gateway address. If the workstation is configured to obtain an IP address automatically, the DHCP server address does not to be configured.
11. What is a result when the DHCP servers are not operational in a network?
- Workstations are assigned with the IP address 0.0.0.0.
- Workstations are assigned with the IP address 127.0.0.1.
- Workstations are assigned with IP addresses in the 10.0.0.0/8 network.
- Workstations are assigned with IP addresses in the 169.254.0.0/16 network.
Explanation: When workstations are configured with obtaining IP address automatically but DHCP servers are not available to respond to the requests, a workstation can assign itself an IP addresses from the 169.254.0.0/16 network.
12. A computer has been assigned an IP address of 169.254.33.16. What command initiates the process of requesting a new IP address?
- ipconfig /release
- net computer
- nslookup
- tracert
Explanation: Forcing a PC to release its DHCP binding allows a new DHCP request operation to occur. The net, tracert, and nslookup commands do not have any effect on DHCP configurations.
13. A device has been assigned the IPv6 address of 2001:0db8:cafe:4500:1000:00d8:0058:00ab/64. Which is the network identifier of the device?
- 2001:0db8:cafe:4500:1000:00d8:0058:00ab
- 2001:0db8:cafe:4500
- 2001
- 1000:00d8:0058:00ab
- 2001:0db8:cafe:4500:1000
Explanation: The address has a prefix length of /64. The first 64 bits represent the network portion, whereas the last 64 bits represent the host portion of the IPv6 address. In this example the network bits are 2001:0db8:cafe:4500.
14. Which filtering method uses IP addresses to specify allowed devices on your network?
- port forwarding
- port triggering
- whitelisting
- MAC address filtering
- blacklisting
Explanation: Whitelisting and blacklisting specify which IP addresses are allowed or denied on your network. This is typically done using an access list or access policy.
15. What is the best description of NetBIOS?
- It is an obsolete and insecure Windows network protocol.
- It is an alternative to TCP/IP on Windows networks.
- It is required for file sharing when using operating systems after Windows 2000.
- NetBIOS replaced NetBT on Windows networks.
Explanation: NetBIOS (Network Basic Input/Output System ) is an obsolete and insecure Windows network protocol. TCP/IP replaced NetBOIS on windows networks. NetBT (NetBIOS over TCP/IP) replaced NetBOIS on Windows networks. NetBOIS or NETBT should only enabled if absolutely required on operating systems earlier than Windows 2000.