Data Communications and Network Services
How many bits make up the single IPv6 hextet :10CD:?
16
What is the valid most compressed format possible of the IPv6 address 2001:0DB8:0000:AB00:0000:0000:0000:1234?
2001:DB8:0:AB00::1234
A DHCP server is used to assign IP addresses dynamically to the hosts on a network. The address pool is configured with 172.30.8.0/24. There are 7 printers on this network that need to use reserved static IP addresses from the pool. How many IP addresses in the pool are left to be assigned to other hosts?
247
A client device has initiated a secure HTTP request to a web browser. Which well-known port address number is associated with the destination address?
443
How is a DHCPDISCOVER transmitted on a network to reach a DHCP server?
A DHCPDISCOVER message is sent with the broadcast IP address as the destination address.
SNMP (Simple Network Management Protocol)
A client packet is received by a server. The packet has a destination port number of 161. What service is the client requesting?
FTP (File Transfer Protocol)
A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?
SSH
A client packet is received by a server. The packet has a destination port number of 22. What service is the client requesting?
HTTPS
A client packet is received by a server. The packet has a destination port number of 443. What service is the client requesting?
DNS (Domain Name System)
A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?
DHCP (Dynamic Host Configuration Protocol)
A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?
transport
A destination PC receives an email message with the sequence numbers on packets out of order. Which layer of the TCP/IP model is responsible for reassembling the packets of the message in the correct order?
Dual stack
Allows IPv4 and IPv6 to coexist on the same network segment. Dual stack devices run both IPv4 and IPv6 protocol stacks simultaneously. Known as native IPv6, this means the customer network has an IPv6 connection to its ISP and is able to access content found on the internet over IPv6.
A host PC is attempting to lease an address through DHCP. What message is sent by the server to let the client know it is able to use the provided IP information?
DHCPACK
Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server?
DHCPREQUEST
Which of the following techniques use native IPv6 connectivity?
Dual Stack
Which protocol is used to transfer web pages from a server to a client device?
HTTP
Which protocol retains a message in a mailbox on a server, even after the message is accessed by a user on a local client device?
IMAP4
Link-local address
IPv6 addresses can use the link-local address when communicating with a device on the same network.
Tunneling
Is a method of transporting an IPv6 packet over an IPv4 network. The IPv6 packet is encapsulated inside an IPv4 packet, similar to other types of data.
Uniform Resource Identifier (URI)
Is a string of characters that identifies a specific network resource
What purpose does NAT64 serve in IPv6?
It converts IPv6 packets into IPv4 packets.
What is a function of a DNS server?
It determines the IP address that is associated with a specific host domain name.
Why is DHCP for IPv4 preferred for use on large networks?
It is a more efficient way to manage IPv4 addresses than static address assignment is.
Which statement accurately describes dynamic NAT?
It provides an automated mapping of inside local to inside global IP addresses.
benefits of the IPv6 protocol
No need for NAT. Each device can have its own globally routable address. Autoconfiguration capabilities simplify address administration.
Which two protocols are used in the process of sending and receiving emails? (Choose two.)
POP SMTP
Dynamic Host Configuration Protocol (DHCP)
Rather than have the network administrator assign IPv4 addresses for each workstation, it is easier to have IPv4 addresses assigned automatically. This is done using a protocol known as
Address autoconfiguration
SLAAC allows a host to create its own GUA without the need for a DHCP server.
What is the result if the default gateway address is misconfigured on a PC?
The PC can communicate with devices in the same network but not with those in remote networks.
How does a client computer determine what source port number to assign to a UDP header?
The port number is random within the range of dynamic port numbers.
Network Address Translation (NAT)
The process used to convert private addresses to internet-routable addresses. A private (local) source IPv4 address is translated to a public (global) address
Uniform Resource Locator (URL)
This defines the network location of a specific resource on the network. HTTP or HTTPS URLs are typically used with web browsers. Other protocols such as FTP, SFTP, SSH, and others can use a URL. A URL using SFTP might look like: sftp://sftp.example.com.
Uniform Resource Name (URN)
This identifies only the namespace of the resource (web page, document, image, etc.) without reference to the protocol
Router
Typically, which network device would be used to perform NAT for a corporate environment?
What is an advantage of UDP over TCP?
UDP communication requires less overhead.
Depletion of IPv4 addresses
What is the most important motivating factor for moving to IPv6?
Link local
What type of IPv6 address is FE80::1?
Netstat
Which Windows command would display the protocols in use, the local address and port numbers, the foreign address and port numbers, and the connection state?
POP and IMAP
Which application protocols are used to by clients to retrieve email messages? (two.)
Transport Layer
Which layer of the TCP/IP model is responsible for ensuring packets are sent reliably and any missing packets are resent?
SLAAC
Which method of IPv6 prefix assignment relies on the prefix contained in RA messages?
Dual Stack
Which of the following techniques use native IPv6 connectivity?
Well Known Ports
Which port group includes port numbers for FTP, HTTP, and TFTP applications?
Which type of applications are best suited to use UDP as the transport layer protocol?
applications that require minimal transmission delay
What is the most important motivating factor for moving to IPv6?
depletion of IPv4 addresses
What type of server would use IMAP?
Internet Control Message Protocol version 6 (ICMPv6)
includes address resolution and address autoconfiguration not found in ICMP for IPv4 (ICMPv4)
Tunneling
is a method of transporting an IPv6 packet over an IPv4 network. The IPv6 packet is encapsulated inside an IPv4 packet, similar to other types of data.
Which type of IPv6 address is not routable and used only for communication on a single subnet?
link-local address
What is an advantage of using IPv6 ?
more addresses for networks and hosts
Which two types of devices are typically assigned static IP addresses?
printers web server
Typically, which network device would be used to perform NAT for a corporate environment?
router
Which three types of nodes should be assigned static IP addresses on a network? (Choose three.)
servers printers gateways
What is a socket?
the combination of a source IP address and port number or a destination IP address and port number
Which characteristic describes the default gateway of a host computer
the logical address of the router interface on the same network as the host computer
Which three pieces of information are identified by a URL? (Choose three.)
the protocol that is being used the domain name that is being accessed the location of the resource
What is the purpose of using a source port number in a TCP communication?
to keep track of multiple conversations between devices
An employee is having connectivity issues. Why might a network technician try to ping the default gateway from the employee laptop?
to verify connectivity with the device that provides access to remote networks
What layer of the TCP/IP suite makes sure that all the data packets of a message arrive safely at the destination?
transport
