Net 104 M2

forwarding DNS server

receives queries from local clients but doesn't work to resolve the queries

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

1

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

123

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

127.0.0.1

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

192.168.0.10

caching DNS server

A server that accesses public DNS data and caches the DNS information it collects.

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. Root server b. Default gateway c. DHCP server d. DNS server

Default gateway

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. FF00::/8 c. FE80::/64 d. 2000::/3

FE80::/64

IPv4

IPv4 addresses have 32bits and are written as four decimal numbers called octets. (Network layer IP) 5 different classes, Class A, B, C, D , and E. Class A, B, and C are public IP addresses.

IPv6

IPv6 addresses have 128 bits and are written as eight blocks of hexadecimal number. (Network layer IP)

SRV (Service) record

Identifies the hostname and port of a computer that hosts a specific network service besides email, such as FTP or SIP.

CNAME

In a DNS database, which of the choices describes the record that holds the alternative names for a host?

AAAA

In a DNS database, which of the choices describes the record that holds the name-to-address mapping for iPv6 addresses?

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

It points to the SMTP server for the domain

•top-level domain (TLD)

Last part of an FQDN

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

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

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

MX record

Network layer IP

Network layer IP (Internet Address) address can be used to find any computer in the world.

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

Primary DNS server

Recursive

Which choice describes a DNS name resolution request that requires a resolution or answer?

Data link layer MAC (Media Access Control)

address is 48 bits, written as six hex numbers separated by colons. It is also called a physical address. MAC addresses are embedded on every NIC in the world.

Neighbors (IPv6)

are two or more nodes on the same link

Global address

can be routed on the Internet

SOA (Start of Authority)

gives information about the zone

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

ipconfig /flushdns

Tunneling (IPv6)

is a method used by IPv6 to transport IPv6 packets through or over and IPv4 network.

Network Address Translation (NAT)

is a technique designed to conserve public IP addresses needed by a network.

Interface ID

is the lats 64 bits or four blocks of an IPv6 address that identify the interface.

A Link (IPv6)

sometimes called local link is any LAN bounded by routers.

Unicast address

specifies a single node on a network

PTR (Pointer) record

used for reverse lookups

authoritative name server

•An authoritative name server is the authority on computer names and their IP addresses for computers in their domains

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 secondary and primary DNS servers because the secondary server is requesting zone transfers from the primary server b. The caching and primary DNS servers because the caching 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

The secondary and primary DNS servers because the secondary server is requesting zone transfers from the primary server

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

255

A URL (uniform resource locator)

is an addressing scheme that identifies where to find a particular resource on a network

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

255.255.0.0

Which part of a MAC address is unique to each manufacturer? a. The OUI b. The physical address c. The network identifier d. The device identifier

The OUI

Which of the following command-line commands would display time sync information for an NTP client? w32time query peers w32tm /query /peers w32tm query peers w32time /query /peers

w32tm /query /peers

Resolvers

•- a DNS client that requests information from DNS name servers

A port

•A port is a number assigned to a process that can receive data •Port numbers ensure data is transmitted to the correct process among multiple processes running on a single device

•Port numbers are divided into three types:

•Well-known ports - 0 to 1023 •Registered ports - 1024 to 49151 •Dynamic and private ports - 49152 to 65535

recursive lookup

•a query that demands a resolution or the answer "It can't be found"

Iterative lookup

•a query where the local server issues queries to other servers •Other servers only provide information if they have it •Do not demand a resolution

A socket

•consists of host's IP address and the port number of an application running on the host •A colon separates the two values •Example - 10.43.3.87:23

Name servers

•hold databases, which are organized in a hierarchical structure

A (address) record

•stores the name-to-address mapping for a host

AAAA (Address) record

holds the name to address mapping, but the IP address is an IPv6 type IP address

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

255.255.255.240

Application layer

Application Layer FQDNs, computer names, and host names. Fully qualified domain name (FQDN) - a unique character-based name.

secondary DNS server

The backup authoritative name server for an organization.

Transport layer

Transport layer port numbers are used to find applications.

MX (Mail Exchange)

identifies e-mail servers within your domain

Dual tacked (IPv6)

is when a network is configured to use both IPv4 and IPv6

SNAT (Source Network Address Translation)

the gateway assigns the same public IP address to a host each time it makes a request to access the Internet.

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

Answer: d. 64.233.177.189 IP addresses within the ranges of 10.0.0.0 through 10.255.255.255, 172.16.0.0 through 172.31.255.255, and 192.168.0.0 through 192.168.255.255 are RFC1918, or private, IP addresses. The address 64.233.177.189 is a public IP address.

Primary DNS server

The authoritative name server for an organization, which holds the authoritative DNS database for the organization's zones. This server is contacted by clients, both local and over the Internet, to resolve DNS queries for the organization's domains.

A

In a dns database, which of the choices describes the record that holds the name to address mapping for IPv4 addresses

NS (Name Server)

Indicates the authoritative name server for a domain

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 static device Points an IP address to a mail server Point an IP address to a name server

Points an IP address to a static device

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

Resolving hostnames to IP addresses

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

Sends network communication to a specific set of hosts

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

To ensure high-availability of the DNS Server

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

UDP

Namespace

•the entire collection of computer names and their associated IP addresses stored in databases on DNS name servers around the globe

TXT (text)

holds any type of free-form text

Which of these commands has no parameters in Windows? hostname ping ipconfig nslookup

hostname

DNAT (Dynamic Network Address Translation)

the gateway has a pool of public address that is free to assign to a local host when it makes a request to access the Internet.

CNAME (Canonical name record)

holds alternative names for a host

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. ipconfig /renew b. ifconfig /renew c. ipconfig /release d. ifconfig /release

ipconfig /release

Port Address Translation (PAT)

is the process of assigning a TCP port number to each ongoing session between a local host and Internet host.

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

d. All devices on your local network