Ccent/ccna Icnd1 Chapter 5

Front 1

[501] Which layer defines routing and addressing?

Back 1

[501] Layer 3

Front 2

[502] Which layer is responsible for end-to-end delivery of packets?

Back 2

[502] Layer 3

Front 3

[503] What does ARP stand for, and what is it?

Back 3

[503] Address Resolution Protocol. It is used to dynamically learn the data-link address of an IP host connected to a LAN

Front 4

[504] What is the name for logical groups of addresses in TCP/IP?

Back 4

[504] Subnet or network

Front 5

[505] What is the name for logical groups of addresses in AppleTalk?

Back 5

[505] Cable range

Front 6

[506] What is the name for logical groups of addresses in IPX?

Back 6

[506] Network

Front 7

[507] How many bits is an IP address? What is the name and size of the Grouping Field? What is the name and size of the Local Address Field?

Back 7

[507] 32 bits. The Subnet or network portion is variable, between 8 and 30 bits. The Host portion is variable, between 2 and 24 bits.

Front 8

[508] How many bits is an IPX address? What is the name and size of the Grouping Field? What is the name and size of the Local Address Field?

Back 8

[508] 80 bits. The Network portion is 32 bits. The Node portion is 48 bits.

Front 9

[509] How many bits is an AppleTalk address? What is the name and size of the Grouping Field? What is the name and size of the Local Address Field?

Back 9

[509] 24 bits. The Network portion is 16 bits. The Node portion is 8 bits.

Front 10

[510] What is the difference between a routing protocol and a routed protocol?

Back 10

[510] A routing protocol learns routes and put those routes in a routing table. A routed protocol is the type of packet forwarded through a network. RIP is a routing protocol, IP is a routed protocol.

Front 11

[511] If two computers are separated by a router, what must be true of their addresses?

Back 11

[511] Their addresses must be in different groups

Front 12

[512] How many bits make up the network portion of a Class A IP address?

Back 12

[512] 8 bits, leaving 24 for the host portion

Front 13

[513] How many bits make up the network portion of a Class B IP address?

Back 13

[513] 16 bits, leaving 16 for the host portion

Front 14

[514] How many bits make up the network portion of a Class C IP address?

Back 14

[514] 24 bits, leaving 8 for the host portion

Front 15

[515] How many addresses are available in a Class A networK? Class B? Class C?

Back 15

[515] Class A = (2^24)-2 Class B = (2^16)-2 Class C = (2^8)-2

Front 16

[516] List the interesting powers of 2, up to 32

Back 16

[516] 2^2=4, 2^3=8, 2^4=16, 2^5=32, 2^6=64, 2^7=128, 2^8=256, 2^9=512, 2^10=1024, 2^11=2048, 2^12=4096, 2^16=65,536, 2^32=4,294,967,296

Front 17

[517] Which addresses are reserved in each Class A, B, or C network?

Back 17

[517] The network number and the broadcast address - the lowest numerical value inside the network, and the largest

Front 18

[518] Which body is responsible for assigning IP addresses?

Back 18

[518] The Network Information Center (NIC)

Front 19

[519] What are the valid network numbers for Class A networks? How many total networks are available?

Back 19

[519] 1.0.0.0 to 126.0.0.0 - (2^7)-2

Front 20

[520] What are the valid network numbers for Class B networks? How many total networks are available?

Back 20

[520] 128.1.0.0 to 191.254.0.0 - (2^14)-2

Front 21

[521] What are the valid network numbers for Class C networks? How many total networks are available?

Back 21

[521] 192.0.1.0 to 223.255.254.0 - (2^21)-2

Front 22

[522] What does URL stand for?

Back 22

[522] Universal Resource Locator

Front 23

[523] What does DNS stand for?

Back 23

[523] Domain Name System

Front 24

[524] What does DHCP stand for?

Back 24

[524] Dynamic Host Configuration Protocol

Front 25

[525] What does PING stand for?

Back 25

]525] Packet INternet Groper

Front 26

[526] What does ICMP stand for?

Back 26

[526] Internet Control Message Protocol

Front 27

[527] What are the three main protocols for assigning IP addresses dynamically?

Back 27

[527] RARP, BOOTP, and DHCP

Front 28

[528] What does BOOTP stand for?

Back 28

[528] Boot Protocol

Front 29

[529] What does RARP stand for?

Back 29

[529] Reverse ARP

Front 30

[530] What information can a computer using RARP request?

Back 30

[530] IP address - that's it

Front 31

[531] What information can a computer using BOOTP request?

Back 31

[531] IP address, subnet mask, default gateway, other server IP addresses, and the name of a file that the computer should download

Front 32

[532] What is the main advantage of DHCP over RARP and BOOTP?

Back 32

[532] Both RARP and BOOTP require a server which knows the MAC address of every computer connected, as well as configuration parameters for each computer that requests an IP.

Front 33

[533] What are the goals of routing protocols?

Back 33

[533] 1. To dynamically learn and fill the routing table with a route to all subnets in the network. 2. If more than one route to a subnet is available, to place the best route in the routing table. 3. To notice when routes in the routing table are no longer valid, and to remove those routes from the routing table. 4. If a route is removed from the routing table and another route through another neighboring router is available, to add the route to the routing table. 5. To add new routes, or replace existing routes with the best currently available route as quickly as possible. 6. To prevent routing loops.

Front 34

[534] What is convergence time?

Back 34

[534] The time between losing a route and find a working replacement

Front 35

[535] When do routes for directly connected subnets get added to the routing table?

Back 35

[535] When the interface is first initialized

Front 36

arp

Back 36

address resolution protocol, Internet protocl used to map an IP address to a mac address (RFC 826)

Front 37

default gateway/default router

Back 37

on IP host, IP address of some router to which the host sends packets when the packets's destination address is on a subnet other than the local subnet

Front 38

dhcp

Back 38

dynamic host configuration protocl - used by hosts to dynamically discover and lease an IP address, learn correc subnet mask, default gateway, and DNS server IP addresses

Front 39

dns

Back 39

domain name system, application layer protocl used through the internet for translating hostnames into their associated IP addresses

Front 40

host part

Back 40

term jused to describe part of an Pv4 address used to uniquely identify a host inside a subnet - identified by bits of value 0 in subnet mask

Front 41

IP address

Back 41

32 bit address assigned to hosts using TCP/IP - consists of network number, optinal subnetowrk number, and a host number - network and subnet work numbers are used for routing - host number addresses inidivual hosts on a network or subnetwork

Front 42

logical address

Back 42

generic reference to address as defined by Layer 3 protocols - contrast with data-link address (considered to be physical)

Front 43

network broadcast address

Back 43

special address in each classful network that can be use to broadcast a packet to all hosts in same network

Front 44

network number/network address

Back 44

uses decimal notation but represts all hosts in a single class network (ex 10.0.0.0)

Front 45

network part

Back 45

port of IPv4 address that is 1,2 or 3 bytes long depending on class

Front 46

routing table

Back 46

list of routes in a router, each route lists the destination subnet and mask, router interface out which to forward packets destine to that subnet, and next hop routers IP address

Front 47

subnet broadcast address

Back 47

address in each subnet - largest numberic address, designed so that packets sent to this addresss go to all hosts on subnet

Front 48

subnet number/subnet address

Back 48

represents all addresses in a single subnet - smallest value in range, can't be used as unicast address

Front 49

subnet part

Back 49

one of three parts of IPv4 address - identifies different subnets in classful IP network