100-150 Practice Test 6 — 10 Questions

Question 1

What is the primary function of the Address Resolution Protocol (ARP) in an IPv4 network?

Accepted Answer

It maps a known IPv4 address to a corresponding MAC address.. ARP (Address Resolution Protocol) is used when a host knows the IPv4 address of a destination on the same local network but needs the corresponding MAC address to build the Layer 2 frame. The host broadcasts an ARP request asking 'Who has IP X? Tell MAC Y,' and the owner of that IP replies with its MAC address. This mapping is then cached in the ARP table for future use.

Answer

It maps a known MAC address to a dynamically assigned IP address.

Answer

It translates human-readable domain names into numerical IP addresses.

Answer

It provides a secure encrypted tunnel for data transmission between hosts.

Question 2

Which device is primarily responsible for managing traffic between different IP subnets in a corporate network?

Accepted Answer

Router. A router operates at Layer 3 (Network layer) and is responsible for forwarding packets between different IP subnets by examining IP addresses and making routing decisions. It maintains a routing table and uses protocols like OSPF or BGP to determine the best path. This makes it the primary device for inter-subnet traffic management in a corporate network.

Answer

Layer 2 Switch

Answer

Hub

Answer

Repeater

Question 3

A network administrator needs to prevent unauthorized devices from connecting to a switch port while ensuring that only a specific workstation can access the network. Which security feature should be implemented?

Accepted Answer

Port Security. Port security limits the number of valid MAC addresses allowed on a port and binds a specific MAC address to a physical interface. This prevents unauthorized devices from spoofing addresses or connecting rogue hardware to the enterprise network. Implementing this feature is a fundamental step in securing the access layer against layer 2 attacks like MAC flooding or unauthorized device insertion, ensuring only authenticated hardware gains link connectivity.

Answer

DHCP Snooping

Answer

Dynamic ARP Inspection

Answer

VLAN Trunking Protocol

Question 4

An office uses Power over Ethernet (PoE) to provide power to IP phones. Which device is responsible for acting as the Power Sourcing Equipment (PSE) in this scenario?

Accepted Answer

The PoE-capable Switch. In a PoE environment, the Power Sourcing Equipment (PSE) is the device that injects power into the Ethernet cable. Usually, this is a PoE-capable switch. Understanding the roles of PSE and Powered Devices (PD) is vital for troubleshooting power-related issues at the network edge where endpoints are connected.

Answer

The IP Phone

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The DHCP Server

Answer

The Patch Panel

Question 5

A network administrator is documenting the IPv6 addressing scheme for a new campus. The administrator must identify which statements about IPv6 address structure and notation are accurate. (Choose two.)

Accepted Answer

Leading zeros within each 16-bit group of an IPv6 address can be omitted to shorten the notation.. IPv6 text representation permits two key shortcuts: suppressing leading zeros inside each hextet and replacing one contiguous run of zero hextets with a double colon. The double colon may appear only once to keep the address unambiguous. Dotted-decimal masks and removal of trailing zeros are not valid, since they would either mix IPv4 conventions or alter the numeric value of the address.

Answer

An IPv6 address can contain multiple double colon sequences as long as each replaces a different zero run.

Answer

The IPv6 prefix length is expressed in dotted-decimal notation following a space, such as 2001:db8::1 255.255.255.0.

Answer

Trailing zeros at the end of a hextet may be removed to shorten the address, so 2001:0db0::1 can be written as 2001:0db::1.

Question 6

A technician is terminating a UTP cable and notices that the plastic clip on the RJ-45 connector is broken. What is the most likely consequence of using this connector for a network endpoint?

Accepted Answer

The connection will experience intermittent link drops.. The RJ-45 retention clip locks the connector into the port and maintains consistent contact pressure between the eight gold pins and the port's contacts. A broken clip allows the plug to slide slightly, breaking or degrading individual pin contacts, which produces intermittent link drops and CRC errors. The link may come up and then drop repeatedly as the cable shifts.

Answer

The cable will only support half-duplex speeds.

Answer

The cable will cause a short circuit in the switch.

Answer

Data will be transmitted without encryption.

Question 7

A network engineer needs to allocate a subnet for a link connecting two routers. Which prefix provides the most efficient addressing for a point-to-point connection?

Accepted Answer

/30. A /30 mask leaves 2 host bits, yielding exactly 2 usable addresses — one for each router interface on the point-to-point link. That is the minimum needed for a functional link, so /30 is the most efficient allocation without wasting addresses.

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/24

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/28

Answer

/29

Question 8

Which IPv6 address type is represented by the prefix fe80::/10?

Accepted Answer

Link-Local. The fe80::/10 prefix is reserved for Link-Local addresses in IPv6. These addresses are automatically configured on all IPv6-enabled interfaces and are essential for neighbor discovery and routing protocol communication on a single local link. Unlike global unicast addresses, these are not routable outside the local segment, making them fundamental for basic connectivity and troubleshooting in IPv6 environments.

Answer

Global Unicast

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Unique Local

Answer

Multicast

Question 9

A network technician is selecting devices to protect a corporate network from external threats. Which TWO devices provide active threat mitigation by inspecting and blocking malicious traffic? (Choose TWO).

Accepted Answer

Firewall. Network security requires a multi-layered approach to protect against diverse threats. Firewalls and Intrusion Prevention Systems (IPS) are two fundamental components that work together to secure the perimeter and internal segments. Understanding the distinct roles these technologies play helps technicians design robust networks that can both block bad traffic and detect anomalies.

Answer

Antivirus

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Honeypot

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Load Balancer

Question 10

A network administrator is documenting a subnet used for a point-to-point WAN link between two Cisco routers. The link is configured with the address 10.10.10.1/30. What is the network address and the usable host range for this subnet?

Accepted Answer

Network 10.10.10.0, usable hosts 10.10.10.1 through 10.10.10.2. A /30 prefix provides two host bits, yielding exactly four addresses per subnet: one network, two usable hosts, and one broadcast. For the address 10.10.10.1/30, the subnet boundaries are multiples of four, so the network is 10.10.10.0, usable hosts are .1 and .2, and the broadcast is .3. This design is common on point-to-point links because it conserves address space.

Answer

Network 10.10.10.0, usable hosts 10.10.10.1 through 10.10.10.4

Answer

Network 10.10.10.4, usable hosts 10.10.10.5 through 10.10.10.6

Answer

Network 10.10.10.1, usable hosts 10.10.10.2 through 10.10.10.3