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N10-009 > Domain 1.7 > Flashcards

Domain 1.7 Flashcards

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1
Q
  1. IPv4 Addressing Fundamentals
    Question: Which of the following is a valid Class A IPv4 address?
    A. 192.168.10.1
    B. 10.25.35.100
    C. 172.30.255.255
    D. 224.0.0.1
A

10.25.35.100

📖 Explanation:
Class A addresses range from 1.0.0.0 to 126.255.255.255. The 10.0.0.0/8 range is a private Class A network.

❌ Why Others Are Incorrect:
A. 192.168.10.1 → Class C private address.
C. 172.30.255.255 → Class B private address (172.16.0.0 – 172.31.255.255).
D. 224.0.0.1 → Multicast address (Class D).

📌 Practical Use:
Large enterprise networks often use Class A private addresses like 10.0.0.0/8.

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2
Q
  1. Private vs. Public IPv4 Addresses
    Question: Which of the following IP addresses is a publicly routable IPv4 address?
    A. 172.16.5.10
    B. 8.8.8.8
    C. 192.168.50.1
    D. 10.200.15.4
A

8.8.8.8

📖 Explanation:
8.8.8.8 is Google’s public DNS server and falls outside of private IP ranges, making it publicly routable.

❌ Why Others Are Incorrect:
A. 172.16.5.10 → Private (Class B: 172.16.0.0 – 172.31.255.255).
C. 192.168.50.1 → Private (Class C: 192.168.0.0 – 192.168.255.255).
D. 10.200.15.4 → Private (Class A: 10.0.0.0 – 10.255.255.255).

📌 Practical Use:
Public IPs are assigned by ISPs for internet access.

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3
Q
  1. APIPA Addressing
    Question: A computer is unable to obtain an IP address from a DHCP server and is assigned 169.254.12.45. What does this indicate?
    A. The computer has assigned itself an APIPA address.
    B. The network is using a private Class A address.
    C. The computer is connected to a VLAN.
    D. The subnet mask has been misconfigured.
A

The computer has assigned itself an APIPA address.

📖 Explanation:
169.254.0.0/16 is the Automatic Private IP Addressing (APIPA) range, used when DHCP fails.

❌ Why Others Are Incorrect:
B. Private Class A → APIPA is not part of private address ranges.
C. VLAN → A VLAN does not cause APIPA addressing.
D. Misconfigured subnet mask → Would not cause APIPA addressing.

📌 Practical Use:
APIPA allows basic communication between local devices when DHCP is unavailable.

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4
Q
  1. Subnet Mask Basics
    Question: What is the default subnet mask for a Class B network?
    A. 255.255.255.0
    B. 255.0.0.0
    C. 255.255.0.0
    D. 255.255.255.255
A

255.255.0.0

📖 Explanation:
A Class B network uses 255.255.0.0 as its default subnet mask, covering 65,536 IP addresses.

❌ Why Others Are Incorrect:
A. 255.255.255.0 → Used in Class C networks.
B. 255.0.0.0 → Used in Class A networks.
D. 255.255.255.255 → Represents a single host (used in routing).

📌 Practical Use:
Class B networks are commonly used in medium to large enterprises.

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5
Q
  1. IPv4 Loopback Address
    Question: Which IPv4 address is used for loopback testing on a local machine?
    A. 127.0.0.1
    B. 172.16.0.1
    C. 169.254.1.1
    D. 192.168.1.1
A

127.0.0.1

📖 Explanation:
127.0.0.1 is the loopback address, used to test local network stack functionality.

❌ Why Others Are Incorrect:
A. 192.168.1.1 → A private Class C address.
B. 172.16.0.1 → A private Class B address.
C. 169.254.1.1 → An APIPA address.

📌 Practical Use:
Ping 127.0.0.1 to check if a device’s network stack is functioning.

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6
Q
  1. IPv4 Addressing Scheme
    Question: Which address is part of the reserved private IPv4 ranges?
    A. 209.165.200.1
    B. 192.168.50.10
    C. 203.0.113.5
    D. 100.64.1.1
A

192.168.50.10

📖 Explanation:
192.168.50.10 belongs to the Class C private range (192.168.0.0 – 192.168.255.255).

❌ Why Others Are Incorrect:
A. 209.165.200.1 → Public address.
C. 203.0.113.5 → Reserved for documentation.
D. 100.64.1.1 → CGNAT (not for internal LAN use).

📌 Practical Use:
Home and small business networks use private IPs like 192.168.1.1.

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7
Q
  1. IPv4 Address Classes
    Question: What is the valid subnet mask for a Class C network?
    A. 255.255.255.0
    B. 255.0.0.0
    C. 255.255.0.0
    D. 255.255.255.128
A

255.255.255.0

📖 Explanation:
A Class C network has a default subnet mask of 255.255.255.0, supporting 254 hosts per subnet.

❌ Why Others Are Incorrect:
B. 255.0.0.0 → Class A subnet mask.
C. 255.255.0.0 → Class B subnet mask.
D. 255.255.255.128 → Custom subnet mask (not default for Class C).

📌 Practical Use:
Most home routers default to Class C (192.168.x.x/24).

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8
Q
  1. CIDR Notation
    Question: What does /24 represent in the subnet 192.168.1.0/24?
    A. 24 available IP addresses.
    B. A subnet mask of 255.255.0.0.
    C. A subnet mask of 255.255.255.0.
    D. A broadcast address.
A

A subnet mask of 255.255.255.0

📖 Explanation:
/24 means a subnet mask of 255.255.255.0, allowing 256 total IPs (254 usable).

❌ Why Others Are Incorrect:
A. 24 available IPs is incorrect; it’s 256 total.
B. 255.255.0.0 → corresponds to /16.
D. A broadcast address is not represented by /24.

📌 Practical Use:
CIDR notation is essential for network subnetting.

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9
Q
  1. IPv4 Broadcast Address
    Question: What is the broadcast address for the 192.168.10.0/24 subnet?
    A. 192.168.10.255
    B. 192.168.10.1
    C. 192.168.10.0
    D. 192.168.11.0
A

192.168.10.255

📖 Explanation:
In a /24 subnet, the broadcast address is always the last IP in the range.

❌ Why Others Are Incorrect:
A. 192.168.10.0 → Network address.
B. 192.168.10.1 → First usable host.
D. 192.168.11.0 → Belongs to a different subnet.

📌 Practical Use:
Broadcast addresses are used to send messages to all devices on a subnet.

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10
Q
  1. First Usable IP in a Subnet
    Question: What is the first usable host address in the 192.168.1.0/24 subnet?
    A. 192.168.1.0
    B. 192.168.1.1
    C. 192.168.1.255
    D. 192.168.1.254
A

192.168.1.1

📖 Explanation:
The .0 address is reserved for the network, so .1 is the first usable.

❌ Why Others Are Incorrect:
A. 192.168.1.0 → Network address.
C. 192.168.1.255 → Broadcast address.
D. 192.168.1.254 → Last usable host in this range.

📌 Practical Use:
192.168.1.1 is commonly used as a router’s default gateway in home networks.

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11
Q
  1. Subnetting for Efficient Addressing
    Question: A company is given the network 192.168.10.0/24 and needs to create four equal subnets. What subnet mask should they use?
    A. 255.255.255.0
    B. 255.255.255.128
    C. 255.255.255.192
    D. 255.255.255.224
A

255.255.255.224

📖 Explanation:
/24 → /26 provides four equal subnets (192.168.10.0/26, 192.168.10.64/26, etc.), each with 62 usable hosts.

📌 Practical Use:
Subnetting optimizes IP address utilization in corporate networks.

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12
Q
  1. Determining Network ID from IP Address
    Question: What is the network ID for the IP address 192.168.50.99 with a subnet mask of 255.255.255.192?
    A. 192.168.50.0
    B. 192.168.50.64
    C. 192.168.50.64
    D. 192.168.50.128
A

192.168.50.64

📖 Explanation:
Subnet mask 255.255.255.192 (/26) creates four subnets in a /24 block (192.168.50.0, 50.64, 50.128, 50.192).
192.168.50.99 falls in 192.168.50.64 - 192.168.50.127. Network ID = 192.168.50.64.

📌 Practical Use:
Understanding network IDs helps with subnet planning.

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13
Q
  1. Usable IP Ranges in a Subnet
    Question: What is the last usable host IP in the 192.168.1.128/26 subnet?
    A. 192.168.1.190
    B. 192.168.1.191
    C. 192.168.1.192
    D. 192.168.1.129
A

192.168.1.190

📖 Explanation:
Subnet ID: 192.168.1.128
Broadcast Address: 192.168.1.191
Last usable IP: 192.168.1.190

📌 Practical Use:
Identifying the last usable address helps with static IP assignments.

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14
Q
  1. Determining IP Address Belonging to a Subnet
    Question: Which IP address belongs to the 172.16.100.0/23 subnet?
    A. 172.16.101.255
    B. 172.16.102.1
    C. 172.16.99.255
    D. 172.16.98.1
A

172.16.101.255

📖 Explanation:
/23 subnet covers two /24 networks: 172.16.100.0 - 172.16.101.255.
172.16.102.1 is outside this range.

📌 Practical Use:
/23 subnets allow more hosts while keeping subnets efficient.

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15
Q
  1. CIDR Notation Interpretation
    Question: What is the total number of usable hosts in a 192.168.10.0/27 subnet?
    A. 62
    B. 30
    C. 30
    D. 14
A

30

📖 Explanation:
/27 = 32 total IPs. 2 reserved (network ID & broadcast), 30 usable hosts.

📌 Practical Use:
Smaller subnets help segment networks and manage IP usage efficiently.

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16
Q
  1. IP Address for Gateway Configuration
    Question: A network administrator is configuring a gateway address for the 192.168.15.0/26 subnet. Which is the most appropriate choice?
    A. 192.168.15.0
    B. 192.168.15.127
    C. 192.168.15.1
    D. 192.168.15.62
Study These Flashcards
A

192.168.15.62

📖 Explanation:
192.168.15.0/26 subnet range: 192.168.15.0 – 192.168.15.63.
Best gateway choices: First usable (192.168.15.1) or last usable (192.168.15.62).

📌 Practical Use:
Choosing a predictable gateway IP helps with network consistency.

17
Q
  1. IPv4 Addressing for Host Devices
    Question: What is the first usable host IP in the subnet 10.1.50.0/25?
    A. 10.1.50.1
    B. 10.1.50.0
    C. 10.1.50.127
    D. 10.1.50.255
Study These Flashcards
A

10.1.50.1

📖 Explanation:
/25 subnet range: 10.1.50.0 – 10.1.50.127
Network ID: 10.1.50.0
First usable IP: 10.1.50.1

📌 Practical Use:
Used for defining host IPs in network planning.

18
Q
  1. Determining Broadcast Address
    Question: What is the broadcast address for the 192.168.20.0/26 subnet?
    A. 192.168.20.0
    B. 192.168.20.63
    C. 192.168.20.62
    D. 192.168.20.1
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A

192.168.20.63

📖 Explanation:
Subnet range: 192.168.20.0 – 192.168.20.63
Broadcast address: 192.168.20.63

📌 Practical Use:
Broadcast addresses allow communication with all devices in a subnet.

19
Q
  1. Subnet Mask Selection
    Question: What subnet mask would provide 500 usable IP addresses?
    A. 255.255.255.0
    B. 255.255.254.0
    C. 255.255.252.0
    D. 255.255.248.0
Study These Flashcards
A

255.255.254.0

📖 Explanation:
/23 (255.255.254.0) provides 510 usable IPs (1024 total – 2).

📌 Practical Use:
Subnet masks determine how many IPs are available in a network.

20
Q
  1. Network Design for Branch Offices
    Question: A company wants multiple branch offices to have their own separate subnets but still be able to communicate with each other. What is the best approach?
    A. Assign the same subnet to all branch offices.
    B. Use VLANs and route traffic using a Layer 3 switch.
    C. Implement a single /16 subnet for all offices.
    D. Use APIPA addresses for each location.
Study These Flashcards
A

Use VLANs and route traffic using a Layer 3 switch

📖 Explanation:
VLANs allow logical segmentation while Layer 3 switches route between them. Each branch office gets a unique subnet.

📌 Practical Use:
VLANs and Layer 3 switches improve network segmentation and scalability.

N10-009 (21 decks)

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