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Cisco CCENT > Network Fundamentals > Flashcards

Network Fundamentals Flashcards

1
Q

What is the valid IP address range that can be assigned to hosts on the subnet that includes the address 172.16.4.6/23?

A

172.16.4.1 - 172.16.5.254

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2
Q

What is the size of the Acknowledgement Number field in a TCP packet header?

A

32 bits

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3
Q

Which Cisco IOS command allows you to change the packet load and other ICMP parameters to test the connectivity to a remote device?

A

Extended ping

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4
Q

Which OSI Layer 3 devices are used to segregate a network into separate broadcast domains?

A

routers

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5
Q

Which protocol requires the receiving station to acknowledge the receipt of packets: Transmission Control Protocol (TCP) or User Datagram Protocol (UDP)?

A

Transmission Control Protocol (TCP)

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6
Q

What is the range of Private address for Class C IP addresses?

A

192.168.0.0 to 192.168.255.255

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7
Q

At which OSI layer does the Internet Protocol (IP) operate?

A

Layer 3 - network layer

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8
Q

Which protocol is connection-oriented: Transmission Control Protocol (TCP) or User Datagram Protocol (UDP)?

A

Transmission Control Protocol (TCP)

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9
Q

At which OSI Layer does the FTP protocol operate?

A

Layer 7 - application layer

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10
Q

In situations where the same subnet mask must be used for multiple interfaces on a router, what principle should guide thy selection of the mask?

A

The mask must provide capacity sufficient for the largest number of hosts on any single interface while also providing the required number of subnets

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11
Q

In general, crossover cables are used between like devices and straightthrough cables between unlike devices. What is the one exception to this rule?

A

When connecting an Ethernet interface on a router to a computer NIC, a crossover cable is used.

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12
Q

What would be the broadcast address if the IP address given is 172.28.23.2 and the subnet mask is 255.255.240.0?

A

172.28.31.255

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13
Q

What is the name of one data unit at the OSI transport layer?

A

a segment

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14
Q

Which OSI Layer 2 devices provide software-based switching of LAN traffic?

A

LAN Bridges

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15
Q

Which TCP port does telnet use to communicate with other hosts?

A

TCP port 23

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16
Q

Which type of cable is used to connect the console port on the switch to a terminal?

A

a rollover console cable

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17
Q

What is the size of the Source field or Destination field in a TCP packet header?

A

16 bits

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18
Q

How many valid host IP addresses are available in the subnet with IP address 172.16.5.2/23?

A

510

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19
Q

What would be the subnet ID if the IP address is 172.28.23.2, the maximum number of hosts per subnet is 254, and the maximum number of subnets possible is 256?

A

172.28.23.0

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20
Q

Which port is used by Simple Network Management Protocol (SNMP) to communicate with other hosts?

A

UDP port 161

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21
Q

Which protocol has less packet overhead: Transmission Control Protocol (TCP) or User Datagram Protocol (UDP)?

A

User Datagram Protocol (UDP)

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22
Q

Which OSI layer uses IP addresses to communicate with hosts?

A

Layer 3 - network layer

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23
Q

Which type of connector is used to connect a Category 5 Ethernet cable to the 10/100 Ethernet port on the switch?

A

an RJ-45 connector

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24
Q

Which one, bridges or switches, allows cut-through as well as store and forward internal processing?

A

switches

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25
Q

What is the term used for the Transmission Control Protocol (TCP) error recovery and windowing process?

A

Positive Acknowledgement and Retransmission (PAR)

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26
Q

Which TCP packet header field contains the control information used for connection establishment?

A

the Flags field

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27
Q

What should be the default gateway for a host that needs to access a server on a network across the local router?

A

IP address of the local interface of the router.

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28
Q

What would be the last usable host IP address in the 192.168.16.64/26 subnet?

A

192.168.16.126

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29
Q

Which cable is used on a router’s wide area network (WAN) interface to connect to the serial ports?

A

Serial cable

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30
Q

Which two Unshielded Twisted Pair (UTP) cable categories support Gigabit Ethernet?

A

UTP categories Cat 5 and Cat 6

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31
Q

Which cable type is the copper-wire LAN cabling standard defined by the Telecommunications Information Association (TIA)?

A

Unshielded Twisted Pair (UTP)

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32
Q

Which command would you use to determine if all seven layers of OSI reference model are operational between a local and remote host, and gain login access to the remote host?

A

telnet

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33
Q

What is the name given to the protocol data unit (PDU) at the transport layer?

A

segment

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34
Q

What is the possible IP range that can be assigned to hosts on the subnet that includes the address 192.168.144.34/29?

A

192.168.144.33 - 192.168.144.38

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35
Q

Which port on the switch connects to a 10BaseT port on a hub using a crossover cable?

A

the 10/100 Ethernet port

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36
Q

The IP address 192.168.5.0/24 is reserved and cannot be given to a host. What is this address called?

A

network ID

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37
Q

How many hosts per subnet can be accommodated with IP address 192.168.2.1 and subnet mask 255.255.255.224?

A

30

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38
Q

Which OSI layered troubleshooting approach would you use if you are unable to ping a remote router from local router and the show interfaces command displays interface up and protocol up?

A

divide and conquer

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39
Q

Which OSI Layer 4 protocol uses port 23 for the telnet command to connect to remote host?

A

Transmission Control Protocol (TCP)

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40
Q

Which type of Ethernet cable is used to connect the 10/100 port on the switch to another switch?

A

a crossover cable

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41
Q

Which UDP port does Trivial File Transfer Protocol (TFTP) use to communicate with other hosts?

A

UDP port 69

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42
Q

Which Transmission Control Protocol (TCP) packet header field specifies the maximum number of unacknowledged bytes allowed at any given point of time?

A

the Window field

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43
Q

At which OSI Layer does the telnet command operate?

A

OSI Layer 7

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44
Q

Which protocol is connectionless: Simple Mail Transfer Protocol (SMTP) or User Datagram Protocol (UDP)?

A

User Datagram Protocol (UDP)

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45
Q

Which OSI Layer 2 hardware device is used to create separate collision domains?

A

switches

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46
Q

Which network devices operate at OSI Layer 1 and provide multiple ports to connect many hosts on the network?

A

Hubs

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47
Q

At which OSI layer does the Secure Sockets Layer (SSL) protocol operate?

A

OSI Layer 4 (Transport Layer)

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48
Q

Which TCP packet header field tells the sender how much data can be transmitted before the sender should stop and wait for acknowledgement?

A

the Window field

49
Q

What is the size of the Sequence Number field in a TCP packet header?

A

32 bits

50
Q

Which TCP port does File Transfer Protocol (FTP) use to communicate with other hosts?

A

TCP port 21

51
Q

Which TCP packet header field indicates whether the header was damaged in transit?

A

the Checksum field

52
Q

Which type of Ethernet cable is used to connect the 10/100 port on the switch to a hub?

A

a crossover cable

53
Q

Which OSI Layer 2 devices provide hardware-based switching of LAN traffic?

A

LAN switches

54
Q

What would be the broadcast address if the IP address given is192.168.2.1 and the subnet mask is 255.255.255.192?

A

192.168.2.63

55
Q

Which TCP port does Post Office Protocol - Version 2 (POP2) use to communicate with other hosts?

A

TCP port 109

56
Q

Which network device enables two hosts on dissimilar networks to communicate with each other?

A

a router

57
Q

At which OSI Layer does the show cdp neighbors command operate?

A

OSI Layer 2

58
Q

Which TCP port is used by the ICMP Echo feature to communicate network connectivity status messages for a target host?

A

TCP port 7

59
Q

What type of cabling should be used when electrical issues may exist in the environment?

A

Fiber optic

60
Q

Which device will provide network connectivity to 200 hosts on the LAN and allocate dedicated bandwidth to each of the hosts?

A

a switch

61
Q

What is the size of the Windows field in a TCP packet header?

A

16 bits

62
Q

Which TCP packet header field specifies the number assigned to the first byte of data in the message segment?

A

Sequence Number

63
Q

What are the two types of IP addresses from the ISP point?

A

Public (registered) and Private

64
Q

What is the size of the Control field in a TCP packet header?

A

6 bits

65
Q

What would be the subnet mask if the IP address is 172.28.23.2, the maximum number of hosts per subnet is 254, and the maximum number of subnets possible is 256?

A

255.255.255.0

66
Q

When default subnet masks are in use, what class of IP address is 133.6.5.4?

A

Class B

67
Q

Which MS-DOS command will enable you to verify the default gateway configuration on a host that is unable to communicate with hosts across a local Cisco router?

A

the ipconfig command

68
Q

Which UDP port does Domain Name Server (DNS) protocol use to communicate with other hosts?

A

UDP port 53

69
Q

Given an IP address 200.1.1.130 with subnet mask 255.255.255.224, what would be the broadcast address for the subnet?

A

200.1.1.159

70
Q

How many hosts per subnet can be accommodated with IP address 172.28.23.2 and subnet mask 255.255.240.0?

A

4094

71
Q

Which type of Ethernet cable is used to connect the 10/100 port on the switch to a router?

A

a straight-through cable

72
Q

Why does a switch-based network perform better than a hub-based network?

A

A switch provides a separate collision domain to each device, reducing collisions. If the cabling and NIC support it, switches also can provide a full duplex connection to hosts.

73
Q

What three OSI Layer 3 parameters required to be configured on a host to communicate with hosts across the router?

A

IP address, subnet mask, and the default gateway

74
Q

What are the components of an IP address?

A

network ID, host ID, and subnet ID

75
Q

What is the default Transmission Control Protocol (TCP) segment payload (in bytes)?

A

536 bytes

76
Q

What is the possible IP range that can be assigned to hosts on the subnet that includes the address 192.168.144.21/28?

A

192.168.144.17 - 192.168.144.30

77
Q

Which TCP port does the World Wide Web (WWW) use to communicate with other hosts?

A

TCP port 80

78
Q

Which TCP port does Post Office Protocol - Version 3 (POP3) use to communicate with other hosts?

A

TCP port 110

79
Q

At which OSI Layer do the wireless access points operate?

A

OSI Layer 2

80
Q

What is the subnet address for IP address 172.16.5.2/23?

A

subnet: 172.16.4.0

81
Q

What is the name given to the protocol data unit (PDU) at the data link layer?

A

frame

82
Q

What is the maximum number of subnets that will be created with IP address 192.168.2.1 and subnet mask 255.255.255.240?

A

16

83
Q

Which ICMP message is sent by the router to the source host to use more efficient routing?

A

ICMP Redirect message

84
Q

What is the broadcast address for IP address 172.16.5.2/23?

A

broadcast: 172.16.5.255

85
Q

How many IP addresses are available for hosts in the 192.168.16.64/26 subnet?

A

62

86
Q

Which Layer 2 devices provide wireless access to Wi-Fi enabled hosts on the network?

A

access points

87
Q

At which OSI layer does the User Datagram Protocol (UDP) operate?

A

transport layer

88
Q

Which network device provides filtering for packets based on the transport layer protocol specification?

A

routers, via the use of extended access control lists

89
Q

What is the range of private address for Class B IP addresses?

A

172.16.0.0 to 172.31.255.255

90
Q

Which type of IP address do you need to lease from Internet Network Information Center (InterNIC)?

A

Public IP address

91
Q

Which TCP port does Simple Mail Transfer Protocol (SMTP) use to communicate with other hosts?

A

TCP port 25

92
Q

How many fields are in a User Datagram Protocol (UDP) packet header?

A

four

93
Q

How many octets of an IP address represent the network portion in a Class C address?

A

the first three octets

94
Q

What is the term used for process in which the acknowledgement field in the TCP packet communicates information to the receiving host about next byte to be received?

A

forward acknowledgement

95
Q

Which network device would you use to connect two networks on different IP subnets?

A

a router

96
Q

Which OSI transport Layer protocol is used by Domain Name System (DNS) and Trivial File Transfer Protocol (TFTP)?

A

User Datagram Protocol (UDP)

97
Q

The network device that only provides the conversion from copper based media transmission technology to optical fiber based media transmission technology operates at which OSI layer?

A

OSI Layer 1

98
Q

Which TCP packet header field contains the sequence number of the next byte of data that will be sent to the sender of the packet?

A

the Acknowledgement Number field

99
Q

What must be the value of the two most significant bits in a Class B IP address?

A

10

100
Q

What would be the host IP address range, if the IP address given is192.168.2.1 and the mask bit is 29?

A

192.168.2.1 to 192.168.2.6

101
Q

Which dedicated software or hardware device is used to permit, deny, or filter data packets based on different trust levels?

A

a firewall

102
Q

Which type of ICMP message is generated when a router faces congestion at any of its interfaces?

A

ICMP Source Quench message

103
Q

Which remote access protocol uses TCP port 23 to access remote host but exchange data in plain text?

A

the telnet command

104
Q

Which Transmission Control Protocol (TCP) mechanism limits the amount of data transfer between two hosts to an acceptable speed?

A

flow control

105
Q

Which international organization is primarily responsible for the allocation of domain name and IP address?

A

Internet Network Information Center (InterNIC)

106
Q

Which OSI Layer 3 parameter misconfiguration will cause a host that can communicate on local segment, to receive IP packets from a host across a router but would not be able to reply to that host?

A

default gateway

107
Q

Which network device provides a common connection point for network hosts and operates at OSI Layer 1?

A

a hub

108
Q

Which OSI transport layer protocol is used by Simple Network Management Protocol (SNMP)?

A

User Datagram Protocol (UDP)

109
Q

What is the name given to the realtime management of the number of packets handled by TCP that can be received without an acknowledgement?

A

windowing

110
Q

What is the length of an Internet Protocol version 6 (IPv6) address?

A

128 bits

111
Q

What is the unit of data at the OSI data link layer?

A

frames

112
Q

What is the name of one data unit at the OSI network layer?

A

a packet

113
Q

Which type of connector is used to connect a multimode fiber (MMF) cable to the 100Base-FX fiber-optic port on the catalyst switches?

A

an MT-RJ Fiber-Optic connector

114
Q

Which TCP port does Hyper Text Transfer Protocol (HTTP) use to communicate with other hosts?

A

TCP port 80

115
Q

What would be the host IP address range, if the IP address given is 172.28.23.2 and the subnet mask is 255.255.255.192?

A

172.28.23.1-172.28.23.62 (not counting the broadcast address and network ID)

116
Q

How many fields are in a TCP packet header?

A

12

117
Q

What type(s) of cabling is required for a 250-meter cable run?

A

Fiber or ThickNet coaxial

118
Q

Which of the bridges and switches uses Application-Specific Integrated Circuits (ASIC’s) for faster internal processing?

A

switches

119
Q

At which layer of the OSI model does the windowing process occur to control the flow of data between sender and receiver?

A

transport layer

Cisco CCENT (5 decks)

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