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