CCNA Chapter 9 Exam Practice

A nibble consists of 4 bits.

Based on the exhibit, there are four broadcast domains. A broadcast domain is a network segment or a portion of a network in which all devices can receive broadcast messages from any other device within the same domain. In the exhibit, each circle represents a separate network segment, and since there are four circles, there are four distinct broadcast domains.

The subnet mask 255.255.254.0 is a Class C subnet mask, which means it has 24 bits for the network portion and 8 bits for the host portion. In dotted decimal notation, the subnet mask 255.255.254.0 can accommodate 500 hosts per subnet because it has a host portion of 8 bits, which allows for 2^8 - 2 = 254 usable hosts per subnet. However, since the question asks for a subnet mask that can accommodate 500 hosts, the closest subnet mask that fulfills this requirement is 255.255.254.0, which allows for 510 usable hosts per subnet.

The given IP address 172.25.0.126 is the last host address for the network 172.25.0.64/26 because the network has a subnet mask of 26 bits, which means it has 64 possible addresses. The first address in the range is the network address (172.25.0.64) and the last address is the broadcast address (172.25.0.127). Therefore, 172.25.0.126 is the last usable host address in the network.

In a subnet with a /27 mask, there are 32 IP addresses in total. However, the first and last addresses are reserved for network and broadcast addresses respectively, leaving 30 usable addresses for hosts. Therefore, the correct answer is 30.

The given range of addresses starts with 2001:0DB8:BC15:00A0:0000:: and ends with 2001:0DB8:BC15:00AF:0000::. In IPv6, the prefix represents the network portion of the address, which is the common part shared by all the addresses in the range. In this case, the common part is 2001:0DB8:BC15:00A, which has a length of 60 bits. Therefore, the prefix for the range of addresses is 60.

The subnet mask /25 would be the best fit for a subnet containing 100 hosts in an IPv4 network. A /25 subnet mask provides 128 IP addresses, with 126 usable addresses for hosts. This is sufficient to accommodate 100 hosts while leaving room for growth. The other options (/23, /24, and /26) would either provide too many addresses (wasting resources) or too few addresses (not enough for 100 hosts).

The subnet mask 255.255.255.248 is a /29 mask, which means it has 3 bits for host addresses. With 3 bits, we can have 2^3 = 8 possible combinations, but 2 of those combinations are reserved for network and broadcast addresses. Therefore, this subnet will provide 6 usable host addresses.

The given network has a subnet mask of 255.255.252.0, which means that the first 22 bits are used for the network address and the remaining 10 bits are used for host addresses. With 10 bits, there are 2^10 = 1024 possible combinations, but two of them are reserved for the network address and the broadcast address. Therefore, there are 1024 - 2 = 1022 available host addresses on this network.

The computer is unable to access the internet because the gateway address is in the wrong subnet. The gateway address is responsible for routing traffic between different networks, and if it is not configured correctly within the same subnet as the computer's IPv6 address, the computer will not be able to communicate with devices outside of its own network.

To accommodate a router with five connected networks, three bits must be borrowed from the host portion of an address. This is because each additional network requires an additional bit to be used as a network address. By borrowing three bits, it allows for a total of eight network addresses (2^3 = 8), which is sufficient to accommodate the five connected networks.

The given address is 2001:DB8:BC15:A:12AB::1/64. In IPv6, the subnet address is obtained by setting all the host bits to zero. Since the subnet mask is /64, the first 64 bits of the address are the network prefix. Therefore, the subnet address for the given address would be 2001:DB8:BC15:A::0.

The company wants to create two subnetworks, one with 10 hosts and another with 18 hosts.

The subnet mask 255.255.255.192 has 6 host bits, which means it can have 2^6 - 2 = 62 hosts in each subnetwork.

To create a subnetwork with 10 hosts, we need a subnet mask with at least 4 host bits. The subnet mask 255.255.255.240 (or /28) satisfies this requirement.

To create a subnetwork with 18 hosts, we need a subnet mask with at least 5 host bits. The subnet mask 255.255.255.248 (or /29) satisfies this requirement.

Therefore, the two networks that would achieve the desired number of hosts are 192.168.1.64/27 and 192.168.1.96/28.

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The given address block is 128.107.0.0/16, which means it has a total of 16 bits for the network portion. To provide the maximum number of equal size subnets, we need to borrow additional bits from the host portion.

The subnet mask 255.255.255.128 has 9 bits set to 1, which means it can create 2^9 (512) subnets. This is the highest number of subnets that can be created while still providing enough host addresses for each subnet. Therefore, the subnet mask 255.255.255.128 is the correct answer.

The correct answer is IP address: 192.168.10.38 subnet mask: 255.255.255.248, default gateway: 192.168.10.33. This configuration falls within the fifth subnet of the given address range. The subnet mask of 255.255.255.248 allows for a maximum of 6 usable host addresses, which is sufficient for the router interface (first usable host) and the workgroup server (last usable host). The default gateway is set to the first usable address in the subnet, ensuring connectivity to the internet.

DHCP is the preferred method of assigning IP addresses to hosts on large networks because it eliminates most address configuration errors. By automatically assigning IP addresses, DHCP reduces the chances of human error in manually configuring addresses. Additionally, DHCP reduces the burden on network support staff by automating the process of assigning and managing IP addresses, allowing them to focus on other tasks.

Predictable static IP addresses should be applied to the servers in the data center for easier identification. This means that each server will have a fixed, permanent IP address that can be easily recognized and tracked by the network administrator. This is important for managing and troubleshooting the servers, as well as for implementing security measures and access controls. Having predictable static IP addresses allows for efficient monitoring of network traffic and ensures that the servers can be easily identified and managed.

When subnetting a /64 IPv6 network prefix, the preferred new prefix is /72. Subnetting involves dividing a network into smaller subnets, and in this case, the original /64 prefix is being subnetted. The new prefix determines the size of the subnets created. A /72 prefix allows for 256 subnets, each with 256 addresses. This provides a good balance between the number of subnets and the number of addresses per subnet, making it the preferred choice for subnetting a /64 network prefix.

When subnetting a network with a subnet mask of 255.255.255.224, each subnet will have 30 usable addresses. However, the given network address of 192.168.5.0 only requires 14 usable addresses. Therefore, each subnet will waste 16 addresses. Since there are 4 subnets (as the subnet mask allows for 4 subnets), the total number of wasted addresses will be 4 x 16 = 64. However, we also need to consider the network address and the broadcast address of each subnet, which are also wasted addresses. Therefore, the total number of wasted addresses is 64 + 2 = 66. Thus, the correct answer is 72, which is the closest option to 66.

Hosts accessible from the Internet are recommended to be grouped into their own subnet or logical addressing group. This is because these hosts are directly accessible from the external network, and separating them into their own subnet can provide an additional layer of security. By isolating these hosts, it becomes easier to apply specific security measures, such as firewall rules and access control lists, to protect them from potential threats originating from the Internet.