IT 341 MIDTERM QUESTIONS & VERIFIED ANSWERS
What are the seven layers of the osi model? - Answers - 1. physical 2. data link. 3.
network. 4. transport 5. session 6. presentation. 7. application
what are the four layers of the tcp/ip model? - Answers - application > transport >
internet > network access
what protocols are used on the tcp/ip application layer? - Answers - http, dns, dhcp, ftp
what protocols are used on the tcp/ip transport layer? - Answers - TCP, udp
what protocols are used on the internet layer? - Answers - ipv4, ipv6
what protocols are used on the network access layer? - Answers - ppp, frame relay,
ethernet
what does the tcpip application layer do? - Answers - represents data to the user, plus
encoding and dialog controls
what does the tcpip transport layer do? - Answers - supports communication between
diverse devices across diverse networks
what does the tcpip internet layer do? - Answers - determines the best path through the
network
what does the tcpip network access layer do? - Answers - controls the hardware
devices and media that make up the network
what is a pdu? - Answers - protocol data unit -
what is the motivator to move to ipv6? - Answers - depletion of ipv4 address spaces
IPv4 and IPv6 Dual-stack: - Answers - Allows IPv4 and IPv6 to coexist on the same
network. Devices run both IPv4 and IPv6 protocol stacks simultaneously.
IPv4 and IPv6 The migration techniques can be divided into three categories: - Answers
- Dual-stack, Tunnelling, and Translation.
Tunnelling - Answers - A method of transporting an IPv6 packet over an IPv4 network.
The IPv6 packet is encapsulated inside an IPv4 packet.
Translation: - Answers - The Network Address Translation 64 (NAT64) allows IPv6-
enabled devices to communicate with IPv4-enabled devices using a translation
, technique similar to NAT for IPv4. An IPv6 packet is translated to an IPv4 packet, and
vice versa.
The first rule to help reduce the notation of IPv6 addresses - Answers - IPv6 addresses
is any leading 0s (zeros) in any 16-bit section or hextet can be omitted.
Rule 2 - Known as the compressed format - Answers - A double colon (::) can replace
any single, contiguous string of one or more 16-bit segments (hextets) consisting of all
0's.
Double colon (::) can only be used once within an address otherwise the address will be
ambiguous.
.
There are three types of IPv6 addresses: - Answers - Unicast
Multicast
Anycast.
Unicast - Answers - Uniquely identifies an interface on an IPv6-enabled device.
A packet sent to a unicast address is received by the interface that is assigned that
address.
Global Unicast - Answers - Similar to a public IPv4 address
Globally unique
Internet routable addresses
Can be configured statically or assigned dynamically
Link-local - Answers - Used to communicate with other devices on the same local link
Confined to a single link; not routable beyond the link
Applications may rely on the existence of a link-local address even when there is no
IPv6 routing. These addresses are comparable to the auto-configuration addresses
169.254.0.0/16 of IPv4.
Loopback - Answers - Used by a host to send a packet to itself and cannot be assigned
to a physical interface.
Unspecified Address - Answers - Cannot be assigned to an interface and is only used
as a source address.
An unspecified address is used as a source address when the device does not yet have
an IPv6 address yet..
Unique Local - Answers - Used for local addressing within a site or between a limited
number of sites.
Layer 1 of OSI - Answers - Physical Link:
- Cables used, types of connectors, how long they can be. - - Ethernet cable specifies
the electrical characteristics of the twisted pair cable.
What are the seven layers of the osi model? - Answers - 1. physical 2. data link. 3.
network. 4. transport 5. session 6. presentation. 7. application
what are the four layers of the tcp/ip model? - Answers - application > transport >
internet > network access
what protocols are used on the tcp/ip application layer? - Answers - http, dns, dhcp, ftp
what protocols are used on the tcp/ip transport layer? - Answers - TCP, udp
what protocols are used on the internet layer? - Answers - ipv4, ipv6
what protocols are used on the network access layer? - Answers - ppp, frame relay,
ethernet
what does the tcpip application layer do? - Answers - represents data to the user, plus
encoding and dialog controls
what does the tcpip transport layer do? - Answers - supports communication between
diverse devices across diverse networks
what does the tcpip internet layer do? - Answers - determines the best path through the
network
what does the tcpip network access layer do? - Answers - controls the hardware
devices and media that make up the network
what is a pdu? - Answers - protocol data unit -
what is the motivator to move to ipv6? - Answers - depletion of ipv4 address spaces
IPv4 and IPv6 Dual-stack: - Answers - Allows IPv4 and IPv6 to coexist on the same
network. Devices run both IPv4 and IPv6 protocol stacks simultaneously.
IPv4 and IPv6 The migration techniques can be divided into three categories: - Answers
- Dual-stack, Tunnelling, and Translation.
Tunnelling - Answers - A method of transporting an IPv6 packet over an IPv4 network.
The IPv6 packet is encapsulated inside an IPv4 packet.
Translation: - Answers - The Network Address Translation 64 (NAT64) allows IPv6-
enabled devices to communicate with IPv4-enabled devices using a translation
, technique similar to NAT for IPv4. An IPv6 packet is translated to an IPv4 packet, and
vice versa.
The first rule to help reduce the notation of IPv6 addresses - Answers - IPv6 addresses
is any leading 0s (zeros) in any 16-bit section or hextet can be omitted.
Rule 2 - Known as the compressed format - Answers - A double colon (::) can replace
any single, contiguous string of one or more 16-bit segments (hextets) consisting of all
0's.
Double colon (::) can only be used once within an address otherwise the address will be
ambiguous.
.
There are three types of IPv6 addresses: - Answers - Unicast
Multicast
Anycast.
Unicast - Answers - Uniquely identifies an interface on an IPv6-enabled device.
A packet sent to a unicast address is received by the interface that is assigned that
address.
Global Unicast - Answers - Similar to a public IPv4 address
Globally unique
Internet routable addresses
Can be configured statically or assigned dynamically
Link-local - Answers - Used to communicate with other devices on the same local link
Confined to a single link; not routable beyond the link
Applications may rely on the existence of a link-local address even when there is no
IPv6 routing. These addresses are comparable to the auto-configuration addresses
169.254.0.0/16 of IPv4.
Loopback - Answers - Used by a host to send a packet to itself and cannot be assigned
to a physical interface.
Unspecified Address - Answers - Cannot be assigned to an interface and is only used
as a source address.
An unspecified address is used as a source address when the device does not yet have
an IPv6 address yet..
Unique Local - Answers - Used for local addressing within a site or between a limited
number of sites.
Layer 1 of OSI - Answers - Physical Link:
- Cables used, types of connectors, how long they can be. - - Ethernet cable specifies
the electrical characteristics of the twisted pair cable.
