Ch 8: Subnets and VLANs Flashcards
A network with a CIDR notation of /26 would have what subnet mask?
255.255.255.192
A network with 10 bits remaining for the host portion will have how many usable host addresses?
1022
An interface that manages traffic from multiple VLANs is known by what term?
trunk port
Which of the following suggestions can help prevent VLAN hopping attacks on a network?
Disable auto trunking and move native VLANs to unused VLANs.
With VTP, where is the VLAN database stored?
On the switch that is known as the stack master.
What IEEE standard specifies how VLAN information appears in frames and how switches interpret that information?
802.1Q
In an IPv6 address, what do the first four blocks or 64 bits of the address represent?
The site prefix or global routing prefix.
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+?
ip helper-address
When an 802.1Q tag is added to an Ethernet frame, where is it placed?
It is inserted between the source address and the Ethernet type field.
How large is the 802.1Q tag that is added to an Ethernet frame when using VLANs?
4 bytes
On a Cisco switch, what would the security association identifier be for VLAN 13?
100013
What command will set the native VLAN on a Juniper switch port?
set native-vlan-id
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?
show vlan
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?
172.16.0.0
What is the maximum number of host IP addresses that can exist in a Class B network?
65,534
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?
router-on-a-stick
When dealing with a Cisco switch, what is NOT one of the pre-established VLANs?
VLAN 1001
A subnet of 255.255.248.0 can be represented by what CIDR notation?
/21
When using IPv6, what would a /64 network likely be assigned to?
A smaller organization or business
What does the VLAN Trunk Protocol (VTP) do?
It shares VLAN database information amongst switches that participate.
Which of the following statements regarding IPv6 subnetting is NOT accurate?
The largest IPv6 subnet capable of being created is a /64.
If the EUI-64 standard is used, what part of an IPv6 address is affected?
The last four blocks of the address.
How many /64 subnets can be created within a /56 prefix?
256
What is NOT one of the ways in which networks are commonly segmented?
by device manufacturer
An IP address of 192.168.18.73/28 has what network ID?
192.168.18.64
Subtracting an interesting octet value from 256 yields what number?
magic number
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?
10.3.0.0/19
How many subnets can a /48 site prefix support?
65,536 subnets
By default, when using classful addressing, how many bits exist in the host portion of a Class A address?
24
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?
255.255.224.0
