Network + Chapter 10 Flashcards

Questions and Answers

How many bits in a Class A IP address are used for host information?

24 bits

What is the formula for determining the number of possible hosts on a network?

2^h - 2 = number of hosts

Which of the following is not a good reason to subnet a network?

To reduce the number of routing entries (correct)

To manage network more efficiently

To enhance security

To improve performance

What is the software that allows you to define VMs and manage resource allocation and sharing among them?

Hypervisor Signup and view all the answers

With virtual, logically defined devices operating at the data link layer, what is used to pass frames between nodes?

Virtual bridge Signup and view all the answers

With which network connection type does the VM obtain IP addressing information from its host?

NAT mode Signup and view all the answers

Which protocol assigns a virtual IP to a group of routers?

VRRP Signup and view all the answers

While designing your network's VLAN topology, what software will you need if using a centrally managed DHCP server?

DHCP relay agent Signup and view all the answers

Which port on a switch manages traffic for multiple VLANs?

Trunk port Signup and view all the answers

Telnet and SSH are called __________ because they use the existing network and its protocols to interface with the switch.

In-band management Signup and view all the answers

What is the network ID with CIDR notation for the IP address 172.16.32.108 with the subnet 255.255.255.0?

172.16.32.0 Signup and view all the answers

What is the CIDR notation and super mask for the super-net combining 115.100.10.0 and 115.100.11.0?

/23, 255.255.254.0 Signup and view all the answers

What is the CIDR notation for the subnet to be subleased from the Class C license 120.10.10.0?

/25, 255.255.255.128 Signup and view all the answers

What are four advantages to using virtualization on a network?

Efficient use of resources, cost and energy savings, fault and threat isolation, simple backups, recovery, and replication Signup and view all the answers

How does a vNIC get a MAC address?

vNIC is automatically assigned a MAC address Signup and view all the answers

Sub-netting operates at Layer ___ while VLANs function at Layer _.

3, 2 Signup and view all the answers

Which VLAN on a switch manages untagged frames?

The native VLAN Signup and view all the answers

What kind of attack occurs when an attacker configures a VLAN frame with two tags?

VLAN hopping attack Signup and view all the answers

Why is a BPDU filter needed at the demark point?

To prevent the ISP mixing with local topology Signup and view all the answers

Only one __________ exists on a network using STP?

ROOT bridge Signup and view all the answers

Study Notes

IP Addressing and Subnetting

Class A IP addresses allocate 24 bits for host information.
Formula for calculating possible hosts on a network: (2^h - 2), where h is the number of host bits.
Network ID in CIDR notation for an IP address can be derived; for example, 172.16.32.108 with subnet 255.255.255.0 becomes 172.16.32.0.
Super-netting example: For Class C licenses 115.100.10.0 and 115.100.11.0, the CIDR notation is /23 with a super mask of 255.255.254.0.
Subleasing the first half of Class C IPs (120.10.10.0) results in CIDR notation of /25 and subnet mask of 255.255.255.128.

Virtualization

Virtualization benefits include efficient resource use, cost savings, energy savings, fault and threat isolation, and simplified backups, recovery, and replication.
Hypervisor enables defining and managing VMs, handling resource allocation and sharing.

Network Protocols and Management

Virtual IP assignment to routers is managed by VRRP (Virtual Router Redundancy Protocol).
VLAN traffic is managed using trunk ports.

Virtual Networking Components

vNIC (Virtual Network Interface Card) automatically receives a MAC address.
Virtual bridges operate at the data link layer for frame transfer between nodes.
NAT mode allows VMs to obtain IP addressing from their host.

VLANs

Sub-netting operates at Layer 3, whereas VLANs function at Layer 2.
The native VLAN on a switch manages untagged frames.
VLAN hopping attack involves a malicious actor navigating through tags to access unauthorized VLANs.

Management Techniques

In-band management refers to using Telnet and SSH to interact with switches over existing network protocols.
A DHCP relay agent is necessary when utilizing a centrally managed DHCP server across multiple VLANs.

Network Topology

The presence of a single ROOT bridge is essential in a network utilizing Spanning Tree Protocol (STP).
BPDU filters are crucial at the demarcation point to prevent interference between ISP and local topologies.

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Description

Prepare for the Network+ exam with these flashcards focusing on Chapter 10. Test your knowledge on IP address classes, subnetting principles, and virtualization software. Enhance your understanding of networking concepts essential for certification.