Deck 8: Subnets and VLANs

Question 1

 Only Class B and Class C networks can be subnetted.

Answer 1

False

Question 2

 By default, the native VLAN is the same as the default VLAN.

Answer 2

True

Question 3

 A network with a CIDR notation of /26 would have what subnet mask?

A) 255.255.255.0
B) 255.255.255.192
C) 255.255.255.224
D) 255.255.255.240

Answer 3

B

Question 4

 With VTP, where is the VLAN database stored?

A) On the router responsible for maintaining the VTP database.
B) On the switch that is known as the stack master.
C) On the switch that is configured as the trunk root.
D) On the designated VLAN server for the network.

Question 5

 When an 802.1Q tag is added to an Ethernet frame, where is it placed?

A) It is inserted between the preamble and the destination address.
B) It is inserted between the destination and the source addresses.
C) It is inserted between the source address and the Ethernet type field.
D) It is appended to the end of the frame.

Question 6

 An interface that manages traffic from multiple VLANs is known by what term?

A) access port
B) aggregation port
C) trunk port
D) egress port

Question 7

 What IEEE standard specifies how VLAN information appears in frames and how switches interpret that information?

A) 802.1c
B) 802.1Q
C) 802.1V
D) 802.1d

Question 8

 IPv6 addressing does not utilize classful addressing, therefore every IPv6 address is classless.

Question 9

 A /24 CIDR block is equivalent to a 255.255.255.0 subnet mask.

Question 10

 A network with 10 bits remaining for the host portion will have how many usable host addresses?

A) 510
B) 1022
C) 2046
D) 4192

Question 11

 All that is needed to provide communication between two VLANs is a DHCP relay agent.

Question 12

 Network segmentation at Layer 2 of the OSI model is accomplished using VLANs.

Question 13

 Network segmentation decreases both performance and security on a network.

Question 14

 In order to identify the transmissions that belong to each VLAN, a switch will add a tag to Ethernet frames that identifies the port through which they arrive at the switch.

Question 15

 Which of the following suggestions can help prevent VLAN hopping attacks on a network?

A) Install an additional switch to isolate traffic.
B) Disable auto trunking and move native VLANs to unused VLANs.
C) Install a router to process the untagged traffic on the VLAN.
D) Use MAC address filtering.

Question 16

 In an IPv6 address, what do the first four blocks or 64 bits of the address represent?

A) The usable host portion of the network.
B) The site prefix or global routing prefix.
C) The broadcast domain for the configured host ID.
D) The MAC address of the router assigning the host ID.

Question 17

 A native VLAN mismatch occurs when two access ports that are connected to each other are both tagging traffic with different VLAN IDs.

Question 18

 On certain Cisco products, what command can be used to create and send helper messages that support several types of UDP traffic, including DHCP, TFTP, DNS, and TACACS+?

A) ip create helper server
B) ip new helper
C) set ip helper address
D) ip helper-address

Question 19

 An unmanaged switch can still support the creation of VLANs, provided there is an interface for configuration.

Question 20

 How large is the 802.1Q tag that is added to an Ethernet frame when using VLANs?

A) 4 bytes
B) 8 bytes
C) 12 bytes
D) 20 bytes

Question 21

 By default, when using classful addressing, how many bits exist in the host portion of a Class A address?

A) 8
B) 16
C) 24
D) 32

Question 22

 Which of the following terms is commonly used to describe a VLAN configuration in which one router connects to a switch that supports multiple VLANs?

A) router-on-a-stick
B) branched router
C) router overloading
D) router-on-a-branch

Question 23

 How many /64 subnets can be created within a /56 prefix?

A) 256
B) 512
C) 1024
D) 2048

Question 24

 An IP address of 192.168.18.73/28 has what network ID?

A) 192.168.16.0
B) 192.168.18.64
C) 192.168.18.32
D) 192.168.18.0

Question 25

 If the EUI-64 standard is used, what part of an IPv6 address is affected?

A) The first four blocks of the address.
B) The last four blocks of the address.
C) The middle four blocks of the address.
D) All blocks of the address are affected.

Question 26

 What is the maximum number of host IP addresses that can exist in a Class B network?

A) 1022
B) 8190
C) 32,766
D) 65,534

Question 27

 Which of the following statements regarding IPv6 subnetting is NOT accurate?

A) IPv6 addressing uses no classes, and is therefore classless.
B) IPv6 does not use subnet masks.
C) A single IPv6 subnet is capable of supplying 18,446,744,073,709,551,616 IPv6 addresses.
D) The largest IPv6 subnet capable of being created is a /64.

Question 28

 What command will set the native VLAN on a Juniper switch port?

A) switchport trunk native vlan
B) switchport set native vlan
C) config native vlan
D) set native-vlan-id

Question 29

 What does the VLAN Trunk Protocol (VTP) do?

A) It shares trunking information amongst switches that participate.
B) It shares VLAN database information amongst switches that participate.
C) It is the protocol used by a trunk port for establishing a trunk with another switch.
D) It is the protocol that defines how VLAN tagging is accomplished in an Ethernet network.

Question 30

 How many subnets can a /48 site prefix support?

A) 256 subnets
B) 16384 subnets
C) 65,536 subnets
D) 131,072 subnets

Question 31

 Given a host IP address of 172.16.1.154 and a subnet mask of 255.255.254.0, what is the network ID for this host?

A) 172.16.0.0
B) 172.16.1.0
C) 172.16.2.0
D) 172.0.0.0

Question 32

 When dealing with a Cisco switch, what is NOT one of the pre-established VLANs?

A) VLAN 1
B) VLAN 1001
C) VLAN 1003
D) VLAN 1005

Question 33

 Subtracting an interesting octet value from 256 yields what number?

A) network ID
B) subnet ID
C) magic number
D) host ID

Question 34

 You have been tasked with the creation and design of a network that must support a minimum of 5000 hosts. Which network accomplishes this goal?

A) 10.3.0.0/19
B) 172.20.50.0/23
C) 192.168.0.0/20
D) 10.90.0.0/22

Question 35

 On a Cisco switch, what would the security association identifier be for VLAN 13?

A) 1013
B) 5013
C) 100013
D) 1000130

Question 36

 You are working on a Cisco switch and need to learn what VLANs exist on the switch. Which command will list the current VLANs recognized by the switch?

A) get vlans
B) show vlan
C) list switch-vlans
D) show vlandb

Question 37

 A subnet of 255.255.248.0 can be represented by what CIDR notation?

A) /18
B) /20
C) /21
D) /29

Question 38

 What is NOT one of the ways in which networks are commonly segmented?

A) by geographic location
B) by departmental boundaries
C) by device types
D) by device manufacturer

Question 39

 When using IPv6, what would a /64 network likely be assigned to?

A) A regional Internet registry.
B) A large Internet service provider.
C) A very large organization.
D) A smaller organization or business.

Question 40

 What subnet mask can be used to segment the 172.16.0.0 network to allow for a minimum of 6 subnets while maximizing the number of hosts per subnet?

A) 255.255.248.0
B) 255.255.224.0
C) 255.255.192.0
D) 255.255.128.0

Question 41

 What is a Variable Length Subnet Mask (VLSM), and how is it created?

Question 42

 Where does the term trunk originate from, and how does it apply to modern networking?

Question 43

 How does the logical process of combining bits known as ANDing work?

Question 44

 When a hacker attempts to perform a VLAN hopping attack, what are the two approaches likely to be used?

Question 45

 What are some of the different reasons to use VLANs?

Question 46

 In 1993, the IETF devised a shorthand method for identifying network and host bits in an IP address. What is this method, and how do you use it?

Question 47

 How does a DHCP relay agent allow a centrally managed DHCP server to handle assignments for multiple subnets?

Question 48

 What is the difference between a default VLAN and a native VLAN?

Question 49

 How do unmanaged switches and managed switches differ from each other?

Question 50

 What are some common configuration errors that can occur when configuring VLANs?