View Full Cisco 200-301 Exam Dumps and Practice Test Dumps.

 

Question 301

Which subnet mask provides 30 usable IPv4 host addresses per subnet?

1. 255.255.255.224
2. 255.255.255.240
3. 255.255.255.192
4. 255.255.255.248

Correct Answer: 1

Explanation

A subnet requiring 30 usable host addresses needs 5 host bits because 2⁵ = 32 total addresses. Two addresses are reserved for the network and broadcast addresses, leaving 30 usable addresses. A /27 prefix provides exactly this capacity, and its dotted-decimal subnet mask is 255.255.255.224. A /28 provides only 14 usable addresses, while /26 provides 62. Therefore, 255.255.255.224 is the correct mask for a subnet that needs up to 30 usable IPv4 host addresses.

Question 302

Which OSPF command prevents an interface from sending OSPF hello packets while still advertising the connected network?

1. shutdown
2. passive-interface
3. no network
4. default-information originate

Correct Answer: 2

Explanation

The OSPF passive-interface command prevents OSPF hello packets from being sent through a specified interface. However, the network connected to that interface can still be advertised through OSPF. This is useful for interfaces connected to end-user networks where no OSPF neighbor should be formed. It also improves security by preventing unauthorized devices from attempting to establish OSPF adjacencies. The command is commonly configured under OSPF router configuration mode and can be applied selectively to individual interfaces.

Question 303

What is the primary purpose of an OSPF Area Border Router (ABR)?

1. To assign IP addresses using DHCP
2. To provide NAT translations
3. To connect different OSPF areas
4. To replace the OSPF designated router

Correct Answer: 3

Explanation

An OSPF Area Border Router, or ABR, connects one or more OSPF areas to another OSPF area, commonly Area 0. It maintains separate link-state databases for the areas to which it belongs and exchanges routing information between them. Using multiple areas can reduce the size of the link-state database and limit the scope of certain OSPF updates. An ABR does not perform DHCP or NAT simply because it is an ABR, and it does not replace the designated router function on multiaccess networks.

Question 304

Which protocol is commonly used by Cisco switches to dynamically negotiate whether a link should operate as a trunk?

1. LACP
2. STP
3. VTP
4. DTP

Correct Answer: 4

Explanation

Dynamic Trunking Protocol, or DTP, is a Cisco proprietary protocol used to dynamically negotiate trunking between compatible switch interfaces. Depending on the configured switchport modes, DTP can help determine whether the link becomes an access link or trunk. LACP is used for EtherChannel negotiation, while STP prevents Layer 2 loops. VTP is used to distribute VLAN information between switches. In modern networks, administrators often configure trunking explicitly rather than relying on dynamic negotiation, but DTP remains an important CCNA concept.

Question 305

Which factor is used first when selecting the OSPF router ID if no manual router ID is configured?

1. Highest active loopback interface IP address
2. Lowest physical interface IP address
3. Highest default gateway address
4. Lowest loopback interface IP address

Correct Answer: 1

Explanation

OSPF selects its router ID using a specific order. If a router ID is manually configured, that value is used. Otherwise, OSPF selects the highest IP address from any configured loopback interfaces. If no loopback interface exists, OSPF selects the highest IP address from active physical interfaces. The router ID uniquely identifies the OSPF router within the routing domain. Because a loopback interface is stable compared with many physical interfaces, using a loopback address is generally preferred when configuring an OSPF router ID.

Question 306

Which STP parameter can be changed to influence which switch becomes the root bridge?

1. Interface bandwidth
2. Bridge priority
3. MAC address table timeout
4. Duplex setting

Correct Answer: 2

Explanation

Spanning Tree Protocol uses the bridge ID to elect the root bridge. The bridge ID contains a configurable bridge priority and the switch MAC address. A lower bridge priority is preferred during the election process. Administrators can therefore influence root bridge selection by configuring a lower priority on the switch they want to become root. If priorities are equal, the switch with the lower MAC address wins. Interface bandwidth, MAC table aging, and duplex settings do not directly determine which switch becomes the STP root bridge.

Question 307

Which EtherChannel negotiation protocol uses the desirable and auto modes?

1. LACP
2. DTP
3. PAgP
4. STP

Correct Answer: 3

Explanation

Port Aggregation Protocol, or PAgP, is a Cisco proprietary EtherChannel negotiation protocol. It uses desirable and auto modes to negotiate the formation of an EtherChannel. In desirable mode, the interface actively attempts to negotiate an EtherChannel, while auto waits for the neighboring device to initiate negotiation. LACP is the standards-based alternative and uses active and passive modes. DTP negotiates trunking rather than EtherChannel formation, while STP manages Layer 2 loop prevention.

Question 308

What happens when an extended ACL reaches the end of its configured entries without finding a match?

1. The packet is forwarded automatically
2. The packet is sent to the default gateway
3. The packet is inspected by STP
4. The packet is denied by the implicit deny

Correct Answer: 4

Explanation

Cisco ACLs contain an implicit deny at the end of every access control list. If a packet does not match any explicitly configured permit or deny statement, it is automatically denied when it reaches the implicit deny. This behavior applies to both standard and extended ACLs. Administrators can create an explicit permit ip any any statement when they want unmatched traffic to be allowed. Understanding the implicit deny is essential because forgetting it can unintentionally block traffic after the configured ACL entries are evaluated.

Question 309

Which wireless frequency band commonly provides three non-overlapping 20-MHz channels using channels 1, 6, and 11?

1. 2.4 GHz
2. 5 GHz
3. 6 GHz
4. 60 GHz

Correct Answer: 1

Explanation

The 2.4 GHz Wi-Fi band commonly uses channels 1, 6, and 11 as three non-overlapping 20-MHz channels in many regulatory domains. Using these channels helps reduce adjacent-channel interference when multiple access points operate nearby. The 2.4 GHz band generally provides better range and wall penetration than higher-frequency bands, but it has fewer available channels and can experience more interference. The 5 GHz and 6 GHz bands provide many more channels and are often preferred when greater capacity and reduced congestion are required.

Question 310

Which protocol is commonly used to securely transfer files between Cisco devices over an SSH connection?

1. TFTP
2. FTP
3. SCP
4. HTTP

Correct Answer: 3

Explanation

Secure Copy Protocol, or SCP, transfers files securely between devices using SSH for authentication and encryption. Cisco devices can use SCP to securely copy configuration files, software images, and other files between network devices and an SCP server. TFTP does not provide encryption or authentication and is therefore less secure. FTP can transfer files but does not inherently provide the same security as SCP. SCP is particularly useful when administrators need to move configuration backups or IOS images across a network securely.

Question 311

Which IPv4 address represents the limited broadcast address?

1. 0.0.0.0
2. 127.0.0.1
3. 224.0.0.1
4. 255.255.255.255

Correct Answer: 4

Explanation

The IPv4 address 255.255.255.255 is the limited broadcast address. Packets sent to this address are intended for all IPv4 hosts on the local network segment and are not routed by routers. It is commonly encountered during processes such as initial DHCP communication, when a host may not yet know its own IP address or the address of a DHCP server. The address 0.0.0.0 has other special purposes, while 127.0.0.1 is the IPv4 loopback address and 224.0.0.1 is an IPv4 multicast address.

Question 312

Which command displays the current IPv4 access control lists configured on a Cisco router?

1. show access-lists
2. show ip route
3. show interfaces
4. show running-config

Correct Answer: 1

Explanation

The show access-lists command displays the configured access control lists on a Cisco device. It can show standard and extended ACL entries along with their permit or deny statements and, when available, match counters. These counters can help administrators determine whether traffic is matching particular ACL entries. The show ip route command displays the routing table, while show interfaces provides interface information. Although show running-config can also contain ACL configuration, show access-lists is specifically designed to display ACL entries and their matching statistics.

Question 313

Which TCP mechanism allows a sender to determine that transmitted data has been successfully received?

1. Broadcast addressing
2. Acknowledgments
3. ARP requests
4. MAC learning

Correct Answer: 2

Explanation

TCP uses acknowledgments, commonly called ACKs, to confirm the successful receipt of transmitted data. The receiving device sends acknowledgment information back to the sender, allowing TCP to track which data has arrived. If expected acknowledgments are not received within an appropriate period, TCP can retransmit missing data. This reliability mechanism is one of the major differences between TCP and connectionless protocols such as UDP. ARP is used for IPv4 address-to-MAC resolution, while MAC learning occurs at Layer 2 switches and is unrelated to TCP reliability.

Question 314

Which UDP port is commonly associated with DNS queries?

1. 22
2. 67
3. 53
4. 161

Correct Answer: 3

Explanation

DNS commonly uses UDP port 53 for standard name-resolution queries. A client can send a DNS query to a DNS server using UDP, and the server responds with information such as the IP address associated with a domain name. DNS can also use TCP port 53 for certain operations, including some larger responses and zone transfers. Port 22 is associated with SSH, port 67 is used by DHCP servers, and port 161 is commonly used by SNMP. Knowing common protocol ports is important for CCNA troubleshooting and security questions.

Question 315

Which Cisco command configures an interface to obtain its IPv4 address automatically from a DHCP server?

1. ip address dhcp
2. ip dhcp pool
3. ip helper-address
4. ip route dhcp

Correct Answer: 1

Explanation

The ip address dhcp command configures a router interface to obtain its IPv4 address dynamically from a DHCP server. After the command is applied, the interface acts as a DHCP client and requests addressing information from a DHCP server. The ip dhcp pool command is used to configure a Cisco router as a DHCP server instead. The ip helper-address command forwards certain broadcast-based requests toward a remote server and does not directly configure an interface as a DHCP client. Therefore, ip address dhcp is the correct command.

Question 316

Which HSRP feature provides a virtual default gateway address for hosts?

1. Dynamic ARP Inspection
2. Virtual IP address
3. Loopback address
4. Broadcast address

Correct Answer: 2

Explanation

Hot Standby Router Protocol, or HSRP, provides a virtual IP address that acts as a default gateway for hosts on a network. Multiple routers participate in an HSRP group, with one router acting as the active router and another typically serving as standby. Hosts use the shared virtual IP address rather than depending on a single physical router address. If the active router fails, the standby router can assume the active role while continuing to provide the same virtual gateway address, improving default-gateway availability.

Question 317

Which NTP value indicates the distance of a time source from the authoritative reference clock?

1. VLAN ID
2. Administrative distance
3. Stratum
4. Metric

Correct Answer: 3

Explanation

NTP uses the concept of stratum to indicate the distance of a time source from an authoritative reference clock. A stratum 0 device, such as an atomic clock or GPS reference, is the authoritative time source. NTP servers directly synchronized to such sources are generally stratum 1, while devices synchronized through them may have higher stratum values. Lower stratum numbers generally indicate a time source closer to the reference clock. Stratum helps NTP clients select an appropriate and reliable source for synchronization.

Question 318

Which Ethernet condition can occur when one interface operates at full duplex while the other operates at half duplex?

1. Duplex mismatch
2. VLAN pruning
3. Route poisoning
4. IP fragmentation

Correct Answer: 1

Explanation

A duplex mismatch occurs when two connected Ethernet interfaces use different duplex settings, such as one operating at full duplex and the other at half duplex. This can cause poor network performance, packet loss, late collisions, and excessive errors. Modern Ethernet interfaces commonly use auto-negotiation to determine appropriate speed and duplex settings, but incorrect manual configurations can create mismatches. Duplex mismatch is especially important during troubleshooting because the physical link may appear operational while users experience slow or unreliable communication.

Question 319

Which IPv6 address type is automatically assigned to an interface and is required for IPv6 communication on the local link?

1. Global unicast
2. Anycast
3. Link-local
4. Multicast

Correct Answer: 3

Explanation

An IPv6 link-local address is automatically generated on an IPv6-enabled interface and is required for communication on the local network segment. Link-local addresses use the FE80::/10 prefix and are not routed beyond the local link. They are also used by IPv6 routing protocols and Neighbor Discovery operations. Global unicast addresses are routable across networks, multicast addresses identify groups of interfaces, and anycast addresses identify a group of interfaces where traffic is delivered to the nearest member. Therefore, link-local is the correct answer.

Question 320

Which API direction allows an SDN controller to communicate with and configure network devices?

1. Northbound API
2. Southbound API
3. Public API
4. Web API

Correct Answer: 2

Explanation

A southbound API allows an SDN controller to communicate with and control network devices in the underlying infrastructure. Protocols and interfaces such as OpenFlow, NETCONF, and related mechanisms can serve southbound functions depending on the SDN architecture. In contrast, northbound APIs allow applications and higher-level systems to communicate with the SDN controller. This separation helps distinguish application-facing services from device-facing control. Understanding northbound and southbound interfaces is an important part of the Cisco CCNA network automation and controller-based networking objectives.