The correct answer is that unicast is one-to-one communication, broadcast is one-to-all, multicast is one-to-many, and anycast is one-to-nearest. These four communication types define how data is addressed and delivered across a network, with unicast sending a single packet from one source to one specific destination, broadcast flooding a packet to every host on a subnet, multicast delivering to a subscribed group, and anycast routing to the closest of multiple identical destinations. On the CCNA 200-301 v2 exam, this concept tests your understanding of IPv4 and IPv6 addressing fundamentals, often appearing in questions about traffic flow or matching roles to definitions. A common trap is confusing multicast with broadcast—remember that broadcast reaches all hosts, while multicast only reaches hosts that have joined a specific group. For a quick memory tip, think of unicast as a private conversation, broadcast as a public announcement, multicast as a club meeting, and anycast as finding the nearest coffee shop.
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: a subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Match each networking concept to its most accurate role.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Unicast: one-to-one communication
A subnet mask distinguishes network and host portions of an IP address, enabling proper local and remote delivery decisions. The default gateway is the router's interface on the local subnet, serving as the exit point for traffic destined outside the local network. A MAC address is a hardware identifier used at Layer 2 to deliver frames to the correct next-hop device on the same link. The routing table contains network prefixes and next hops, allowing a router to select the best path for forwarding packets.
Key principle: A subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Unicast: one-to-one communication
Why this is correct
Unicast is the standard method of sending data from one source to a single destination, using a unique IP address for each host.
Related concept
A subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation.
✗
Broadcast: one-to-closest communication
Why it's wrong here
This is incorrect because broadcast is one-to-all, not one-to-closest. One-to-closest describes anycast.
✗
Multicast: one-to-all communication
Why it's wrong here
This is incorrect because multicast is one-to-group, not one-to-all. One-to-all describes broadcast.
✗
Anycast: one-to-group communication
Why it's wrong here
This is incorrect because anycast is one-to-closest, not one-to-group. One-to-group describes multicast.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Unicast: one-to-one communicationCorrect answer▾
Why this is correct
Unicast is the standard method of sending data from one source to a single destination, using a unique IP address for each host.
✗Broadcast: one-to-closest communicationWrong answer — click to see why▾
Why this is wrong here
The specific factual error: broadcast sends to all hosts on a network segment, not just the closest one.
Why candidates choose this
Candidates might confuse broadcast with anycast because both involve multiple recipients, but anycast delivers to the nearest.
✗Multicast: one-to-all communicationWrong answer — click to see why▾
Why this is wrong here
The specific factual error: multicast sends to a specific group of interested hosts, not all hosts on the network.
Why candidates choose this
Candidates often confuse multicast with broadcast because both can reach multiple hosts, but multicast is selective.
✗Anycast: one-to-group communicationWrong answer — click to see why▾
Why this is wrong here
The specific factual error: anycast delivers to the nearest member of a group, not to all members of the group.
Why candidates choose this
Candidates might think anycast is like multicast because both involve a group of receivers, but anycast only sends to one (the closest).
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Learners often confuse the default gateway (a next-hop IP) with the subnet mask (a bit mask defining network boundaries), especially when configuring IP settings; remember that the gateway is where off-subnet packets are sent, while the mask determines if the destination is on the same subnet.
Detailed technical explanation
How to think about this question
The subnet mask is fundamental in IPv4 networking as it determines which bits of an IP address represent the network and which represent the host. This division allows devices to identify whether a destination IP is within the local subnet or requires routing. The subnet mask works by applying a bitwise AND operation with the IP address, isolating the network portion. This concept is essential for subnetting, which optimizes IP address allocation and network segmentation in Cisco environments.
The default gateway serves as the next-hop IP address for packets destined outside the local subnet. When a host determines a destination IP is off-subnet using the subnet mask, it forwards the packet to the default gateway. This gateway is typically a router interface configured to route traffic between different subnets or networks. In Cisco devices, the default gateway setting is crucial for enabling communication beyond the local Layer 2 broadcast domain.
MAC addresses operate at Layer 2 and uniquely identify devices on the local network segment. They are used in frame forwarding within the same subnet, enabling switches to deliver frames to the correct physical device. Routing tables, maintained by routers, contain network prefixes and associated next-hop information. Routers use these tables to decide where to forward packets, based on longest prefix match and routing protocols. Confusing these concepts can lead to misconfigurations and connectivity issues in Cisco networks.
KKey Concepts to Remember
A subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation.
A default gateway is the next-hop router IP address that a host uses to send packets destined for off-subnet networks.
MAC addresses identify devices at Layer 2 and are used by switches to forward frames within the local broadcast domain.
Routing tables store network prefixes and next-hop information that routers use to make forwarding decisions for packets.
Hosts use the subnet mask to decide if a destination IP is local or requires forwarding to the default gateway.
Routers update routing tables dynamically or statically to maintain accurate paths for packet forwarding across networks.
MAC addresses do not participate in Layer 3 routing decisions but are essential for local frame delivery on Ethernet networks.
The default gateway must be reachable within the local subnet for hosts to successfully send traffic off-subnet.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
A subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review a subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — A subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation..
What is the correct answer to this question?
The correct answer is: Unicast: one-to-one communication — A subnet mask distinguishes network and host portions of an IP address, enabling proper local and remote delivery decisions. The default gateway is the router's interface on the local subnet, serving as the exit point for traffic destined outside the local network. A MAC address is a hardware identifier used at Layer 2 to deliver frames to the correct next-hop device on the same link. The routing table contains network prefixes and next hops, allowing a router to select the best path for forwarding packets.
What should I do if I get this 200-301 question wrong?
Review a subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
A subnet mask determines which bits of an IPv4 address represent the network versus the host portion by applying a bitwise AND operation.
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