Networking + 3

What would the subnet mask be of the following network range? 192.168.1.0/28 255.255.255.192 255.255.0.0 255.255.255.0 255.255.255.240

255.255.255.240 (32 bits number 8 per octet)

What numbering system do humans use to write MAC addresses? a. Hexadecimal b. Base-2 c. Decimal d. Binary

a. Hexadecimal

What is the maximum number of NTP Servers that an NTP client can be synchronized with? 4 1 2 Unlimited

1

Which of the following is the Loopback address for IPv4? 172.16.0.1 127.0.0.1 192.168.0.1 10.0.0.1

127.0.0.1

What is the functionality of a DNS Server? Resolving hostnames to IP addresses Determining the number of hops to a resource Allocating IP addresses to hosts Providing internet connectivity to hosts on the network

Resolving hostnames to IP addresses

Which Transport Layer protocol is used by NTP Servers to provide time synchronization? HKLM UDP TCP VLC

UDP

Which IPv6 prefix can be routed on the Internet? a. 2000::/3 b. FE80::/10 c. ::1/128 d. FC00::/7

a. 2000::/3

Which DNS server offers the most current resolution to a DNS query? a. Primary DNS server b. Root DNS server c. TLD DNS server d. Caching DNS server

a. Primary DNS server (always holds the most current records.)

Which type of DNS record identifies an email server? a. CNAME record b. PTR record c. AAAA record d. MX record

d. MX record

Which of the following port is used by NTP Servers to provide time synchronization? 121 1234 123 12

123

What decimal number corresponds to the binary number 11111111? a. 256 b. 255 c. 127 d. 11,111,111

b. 255

Which DNS record type is listed first in a zone file? a. CNAME b. SOA c. AAAA d. A

b. SOA (Start Of Authority)

What command shows you a computer's TCP/IP configuration? a. nmap b. ipconfig c. ping d. ssh

b. ipconfig

Which of the following IPv4 addresses is a public IP address? a. 192.168.72.73 b. 172.16.156.254 c. 64.233.177.189 d. 10.0.2.14

c. 64.233.177.189

What problem will ping google.com check for that ping 8.8.8.8 will not? a. Incorrect DNS server b. Default gateway configuration c. Name resolution issues d. DHCP scope exhaustion

c. Name resolution issues Pinging a host using its host name can verify you have Internet access and functioning name resolution (DNS) services because the host name must first be resolved before the host can be located and pinged.

Which of the following is a Class C Private IP address? 10.0.0.1 172.16.0.12 169.254.1.5 192.168.0.10

192.168.0.10 (Class A Private IP range is 10.0.0.0 - 10.255.255.255. The Class B Private IP range is 172.16.0.0 - 172.31.255.255. Class C Private IP address is 192.168.0.0 - 192.168.255.255. )

The University of Bethesda has requested your professional help in giving a masterclass on how to use Telnet ports for interacting with remote computers. Which of the following ports will you open to teach students how to establish an unencrypted connection with a remote computer? 22 23 80 443

23

When creating a scope on a DHCP server, what is the purpose of specifying an exclusion? An exclusion is specified to ensure specific IP addresses are not automatically allocated to hosts An exclusion automatically assigns the specified IP addresses to a host An exclusion defines the range of IP addresses for the default gateway for the network An exclusion defines the range of IP addresses for a DNS server

An exclusion is specified to ensure specific IP addresses are not automatically allocated to hosts

Your employer has sent you to establish a private IP address for the devices used in Infoglobal Ltd. with the help of a router. Your employer has instructed you to implement the address ranging from 172.16.0.0 to 172.31.255.255 as per IANA's RFC1918 document. Which class of classful addressing will you apply in this scenario? Class D Class A Class B Class C

Class B

On which server will the DHCP server role normally be installed? Domain Client Domain Webserver Domain Controller Domain Member Server

Domain Member Server

What is the functionality of an MX record on a DNS server? It points to the Authorative server in the domain It points to a specific host and port on which the resource is available It points to the SMTP server for the domain It specifies the TTL for caching of a record in the domain

It points to the SMTP server for the domain

Which of the following Stratum Levels is the least Trusted? Level 7 Level 15 Level 0 Level 1

Level 15 Each hop between NTP servers increases the stratum number by 1 up to 16

You are the DNS administrator and have been tasked to identify an email server in a DNS zone file. Which of the following resource records would you apply as a DNS administrator in this case? CNAME record AAAA record PTR record MX record

MX record

Hypervile Solutions has hired Joseph to establish a multimedia session so that it can preview its products to a list of potential clients. Joseph has to ensure that the session is properly encrypted so that there is no loss or theft of data as it will be a closed meeting. Analyze which of the following ports should be opened in this case. Port 3306 Port 1433 Port 3389 Port 5061

Port 5061

Which of the following protocols is used for encrypted control of remote Windows computers? RDP ICMP Syslog NTP

RDP

What is the functionality of a Multicast IP address? Sends network communication to a specific set of hosts Sends network communication to only a specific host Sends network communication to the default gateway Sends network communication to all hosts on the network

Sends network communication to a specific set of hosts (A Unicast address sends network traffic to only a specific host on the network.A Broadcast address sends network communication to all the devices on the network.A Multicast address won't send traffic to the default gateway.)

You have been hired to fix an issue related to the booting up of a computer using a Linux operating system. Before fixing any error, you want to check the history of the previous warning messages that were generated by the system. Which of the following utilities will you use in this scenario? SMB TFTP Syslog LDAP

Syslog

Why would an additional DNS server be implemented in a network? To ensure all devices on the network can connect to the printer To ensure all the hosts receive an IP address automatically To ensure high-availability of the DNS Server To ensure all the hosts on the network can connect to the internet

To ensure high-availability of the DNS Server

Which port should be open so you can remote into the corporate office's Linux Server from a branch office? a. 22 b. 23 c. 3389 d. 1433

a. 22 (ssh)

Suppose you send data to the 11111111 11111111 11111111 11111111 IP address on an IPv4 network. To which device(s) are you transmitting? a. All devices on your local network b. All devices on the Internet c. No devices d. The one device that is configured with this IP address

a. All devices on your local network

What type of device does a computer turn to when attempting to connect with a host with a known IP address on another network? a. Default gateway b. DNS server c. DHCP server d. Root server

a. Default gateway

What protocol does ping use? a. ICMP b. DHCP c. HTTP d. FTP

a. ICMP (internet control message protocol)

When your computer first joins an IPv6 LAN, what is the prefix of the IPv6 address the computer first configures for itself? a. ::1/128 b. 2000::/3 c. FE80::/64 d. FF00::/8

c. FE80::/64 (During IPv6 autoconfiguration, the computer creates its IPv6 address and uses FE80::/64 as the first 64 bits. FF00::/8 is the prefix for multicast addresses. Global unicast addresses begin with 2000::/3. The address ::1/128 is the loopback address and is used to test that an interface and supporting protocol stack is functioning properly.)

When your computer requests a DNS lookup, which DNS server holds the most reliable information for that DNS record? a. Forwarding DNS server b. Root DNS server c. Primary DNS server d. Caching DNS server

c. Primary DNS server

Which command disables a computer's connection to the network? a. sudo hostname testVM b. sudo ip link set eth0 up c. ipconfig /release d. ping localhost

c. ipconfig /release

When hosting a secure email server for access from the Internet, which port should be open on the corporate firewall? a. 443 b. 110 c. 25 d. 587

d. 587 SMTP (Simple Mail Transfer Protocol) is used to send email messages to and between email servers. The old port for SMTP is 25, but encrypted transmissions to an SMTP server use port 587. Port 110 is the non-secure port for POP3, which is another email protocol. Port 443 is the secure port for encrypted HTTP.

Which of these commands has no parameters in Windows? a. ipconfig b. ping c. nslookup d. hostname

d. hostname

What Windows command outputs a computer's MAC address? a. ping b. ipconfig c. oui-lookup d. ipconfig /all

d. ipconfig /all

Which of the following command-line tools is used to query DNS name servers for information about host addresses and other DNS records? dig ip ipconfig ping

dig

Your client has hired you to change the command-line tool from nslookup to dig since it provides more detailed domain information than nslookup. Which of the following commands will you use to perform a DNS lookup on a domain name? apt-get install dnsutils dig google.com dig google.com ANY dig -x 74.125.21.102

dig google.com

You have just installed a network at the Jamieson Hydro Power Plant, and you want to test the basic connectivity of the network. Which of the following utilities will you use first in such a situation so that you get to verify that the TCP/IP is configured correctly and is communicating with the network? dig ip ipconfig ping

ping

What is the Subnet Mask for a Classful Class A IP range? 255.255.255.0 255.255.255.254 255.255.0.0 255.0.0.0

255.0.0.0

What is the purpose of implementing a DHCP server on a network? [Choose all that apply] Automatically assign a DNS server address to a host Let a host automatically connect to resources on the network Resolve IP addresses to hostnames Dynamically allocate IP addresses to hosts on the network Automatically join a host to the domain

Automatically assign a DNS server address to a host Dynamically allocate IP addresses to hosts on the network

What is the function of an A host record in DNS? Points an IP address to a DNS Server Points an IP address to a mail server Point an IP address to a name server Points an IP address to a static device

Points an IP address to a static device (name-to-address mapping for a host)

After installation of the DHCP server role, why is it necessary to restart the DHCP service? To ensure the credentials that were stipulated is applied To assign IP addresses to hosts To ensure the role was successfully installed To ensure the DHCP service is running

To ensure the credentials that were stipulated is applied

What is the functionality of a lease for a DHCP server? It stipulates when an IP address will be allocated to a host It stipulates how long an IP address will be allocated to a host It stipulates how long a device has been active on the network It stipulates when a device will be removed from the network

It stipulates how long an IP address will be allocated to a host

Which of the following command can be used to refresh the DNS records on a host device? ipconfig /flushdns ipconfig /all ipconfig /registerdns ipconfig

ipconfig /registerdns

Your client has hired you to troubleshoot a network error. The client is complaining of an extremely limited network connection on most days and a failed network connection on certain days. Which of the following network configuration issues do you think is at play in this case? Incorrect IP address Incorrect gateway Incorrect subnet mask Duplicate IP address

Incorrect subnet mask (An incorrect subnet mask will result in a failed or extremely limited connection to the network.)

You have just brought online a new secondary DNS server and notice your network-monitoring software reports a significant increase in network traffic. Which two hosts on your network are likely to be causing the increased traffic and why? a. The caching and primary DNS servers because the caching server is requesting zone transfers from the primary server b. The secondary and primary DNS servers because the secondary server is requesting zone transfers from the primary server c. The web server and primary DNS server because the web server is requesting zone transfers from the primary DNS server d. The root and primary DNS servers because the primary server is requesting zone transfers from the root server

b. The secondary and primary DNS servers because the secondary server is requesting zone transfers from the primary server (When a secondary DNS server needs to update its database or when it comes online for the first time, it makes the request to the primary server for the information. The secondary and primary DNS servers then perform a zone transfer from the primary server to the secondary server.)

Which DNS record type is used to find an FQDN from a given IP address? a. CNAME b. PTR c. A d. MX

b. PTR FQDN (Fully Qualified Domain Name) ex: susan.mycompany.com, ftp.mycompany.com

If you are connected to a network that uses DHCP, and you need to terminate your Windows workstation's DHCP lease, which command would you use? a. ifconfig /renew b. ifconfig /release c. ipconfig /renew d. ipconfig /release

d. ipconfig /release