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CNIT 240/344 Exam 2 Questions and Answers 100% correct

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CNIT 240/344 Exam 2 what are the characteristics of IPV4? - Answer-connectionless, "best effort" delivery; unreliable; media independent what does connectionless networking mean? - Answer-sender does not know if the receiver is present or has received the packet, the receiver doesn't know tha...

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  • September 23, 2024
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CNIT 240/344 Exam 2
what are the characteristics of IPV4? - Answer-connectionless, "best effort" delivery;
unreliable; media independent

what does connectionless networking mean? - Answer-sender does not know if the
receiver is present or has received the packet, the receiver doesn't know that the
packet is coming

why is "best effort" delivery unreliable? - Answer-it does not have the capability to
manage and recover from undelivered or corrupt packets

why does IP function very efficiently at the Network Layer? - Answer-because
protocols at other layers manage the reliability

what does it mean that IPv4 is media independent - Answer-IPv4 does not care
about the physical medium, only about the MTU and uses fragmentation to make
sure that packets are split into correct size MTU

fragmentation - Answer-intermediary devices/routers split up a packet when
forwarding it from one media to a media with a smaller MTU

MTU size comparison - Answer-fiber > wireless > copper ethernet > copper serial

major parts of IPv4 packet header - Answer-time to live, upper layer protocol
(TCP/UDP), flag and offset for reconstruction of fragments, 32 bit source and 32 bit
destination

what is time to live - Answer-maximum number of hops before undeliverable

what are the benefits of separating hosts into networks? - Answer-increased
performance, increased security, address management

what kind of addressing does IPv4 use? - Answer-2 level hierarchy: network and
host

octet - Answer-8 bits

what is the benefit of the hierarchy? - Answer-routers only need to know the network
portion, not the address of each individual host

what does a 1 bit in the subnet mask mean? - Answer-the associated address bit
belongs to the network number

what does a 0 bit in the subnet mask mean? - Answer-the associated address bit
belongs to the host number

, what are the two method of expressing subnet mask? - Answer-classful routing and
classless routing

what is classful routing? - Answer-traditional method that uses dotted decimal
notation

what is classless routing? - Answer-classless interdomain routing (CIDR) where the
IP address is followed by a slash and the number of network bits with the remainder
going to the host

what are the two types of addresses? - Answer-MAC address (L2, physical) and
network address (L3, logical)

what is the default gateway? - Answer-the address of the router interface; then
network section must be on the same network as all the hosts

what is the purpose of a router? - Answer-to make forwarding decisions for each
packet that arrives at the gateway interface

(T/F) a packet can be forwarded without a route? - Answer-false

what is a routing table? - Answer-stores information about directly connected and
remote networks

what is a remote network? - Answer-networks that are not directly connected to the
router

what is address resolution? - Answer-the process of mapping a hardware address to
a higher-layer protocol address

address resolution protocol (ARP) - Answer-maps an IPv4 address to a MAC
address

what are the drivers for IPv6? - Answer-not enough IPs in IPv4, policy by
government, 3GPP, IEEE

what are the majors parts of IPv6? - Answer-hop limit, payload length, 128 bits for
source, 128 bits for destination

what are the rules for condensing IPv6 addresses? - Answer-a tuple of all zeroes
can be combined into a single zero, can compress multiple contiguous zero tuples
into a single zero ONLY ONCE

how many network bits in class A? - Answer-8

how many network bits in class B? - Answer-16

how many network bits in class C? - Answer-24

what is the address range for class A? - Answer-0-127 (0)

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