ISM 4220 EXAM 3 - Franks Updated What is the difference in how a router (Layer 3) and a switch (Layer 2) operate? - correct answer Switches match the IP to the destination EUI-48 from ARP to pass traffic around a single network. Where a router interfaces multiple networks and compare destination IP subnet with routing table to determine which network it should be forwarded to.As a network administrator what would you use the subnet portion of your IP range for? - correct answer Segmenting hosts, dividing the network, or separating traffic What is the primary difference in border and internal routers? - correct answer Ownership of the network getting interfaced with.What is the primary use of subnet masks? - correct answer Route decision making How do routers solve multiple row matches in the routing table? - correct answer Cost metric Why is there is a default row in the routing table? - correct answer So only IP ranges with special routes need to be listed If the destination host is on the local subnet, what is listed as the next-hop router? - correct answer Local What is the drawback to decision caching? - correct answer Rapid changing environments can leave stale records causing delays What is the difference in an ARP request and a normal data packet? - correct answer broadcast What is the first field in an IP header? - correct answer Version In IPv4 header what field is used for changing the rate of transmissions between a pair of hosts? - correct answer ECN- Explicit Congestion Notification 1 / 2
This organization is responsible for IP assignments: - correct answer IANA
How long is an IPv6 address? - correct answer128 bits What number system is used to write an IPv6 address? - correct answer Hex (or hexadecimal) An IPv4 or IPv6 address can be abbreviated (either or both)? - correct answerIPv6 only In the IPv6 header what is the Traffic Class used for? - correct answer QoS and congestion notification How does the IP stack know where the IPv6 header extensions end? - correct answer Next Header Value Why does the acknowledgement number not equal the sequence of the packet that it's reporting on? - correct answer Security In TCP, what is an RST packet used for? - correct answer Reset or abrupt close Why is there a limit to the size of a UDP transfer? - correct answerNo segmentation support What is ICANN in charge of? - correct answer Global DNS registration With an IPv4 address that has a 16-bit network segment, what size subnet would you need to allow over 1000 hosts per subnet? - correct answer6 bit What two addresses in every subnet are reserved and not available for hosts? - correct answer all 1's/ all 0's (1=broadcast, 0=DHCP)
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