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Cisco 200-301 Bundle

Exam Code: 200-301

Exam Name Cisco Certified Network Associate (CCNA)

Certification Provider: Cisco

Corresponding Certification: CCNA

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Cisco 200-301 Practice Test 44

Question 430

A client VLAN 75 sits behind router SVI Vlan75. The DHCP server 10.1.1.10 is on another subnet. Where should an IOS `ip helper-address 10.1.1.10` normally be configured?

  1. On every end-user PC as an IOS switchport command.
  2. On the client-facing VLAN 75 routed interface receiving DHCP broadcast requests.
  3. In the DNS A record for the DHCP server name.
  4. Only on the server-facing router interface where replies emerge.

Explanation

Correct Answer

B:

The DHCP relay receives initial broadcasts on the client subnet and forwards them as routed messages to the configured remote server. Applying the helper on the client-facing SVI captures those broadcasts at the proper ingress point and provides information for scope selection. Placing it only on the server-facing interface misses the client broadcasts.

Incorrect Answers

A:

Normal PCs run DHCP clients, not Cisco IOS interface relay commands. The L3 gateway/relay device performs forwarding for their broadcasts.

C:

Name records do not forward broadcast packets or supply DHCP relay gateway information. The IOS interface helper configuration must be present.

D:

That interface does not normally receive the client’s local DHCPDISCOVER broadcast. The helper belongs at the broadcast ingress side of the routed boundary.

Question 431

A branch router WAN interface Gi0/4 connects to an ISP segment where the provider assigns the interface address using DHCPv4, not a static IP. Which Cisco IOS interface command requests an address lease?

  1. `ip address 192.0.2.43 255.255.255.0`.
  2. `ip address dhcp` under the WAN interface.
  3. `ip helper-address 192.0.2.1` as the only interface command.
  4. `service dhcp` without configuring the WAN interface as a DHCP client.

Explanation

Correct Answer

B:

The `ip address dhcp` interface configuration instructs supported IOS devices to act as a DHCPv4 client on that link. The provider DHCP server can supply a leased address and relevant parameters. It is a client operation on the interface, distinct from `ip helper-address` which relays downstream client broadcasts.

Incorrect Answers

A:

That statically assigns 192.0.2.43 rather than accepting the ISP’s dynamic lease. It can conflict with the provider-assigned parameters.

C:

A helper address turns a routed interface into a relay for other clients; it does not request a lease for the router’s own WAN IP.

D:

Enabling DHCP service globally does not replace the interface client address command. The WAN still needs a lease request mechanism.

Question 432

An IOS router acts as a DHCP client on an ISP-facing Ethernet interface and should obtain its WAN IPv4 address dynamically. What interface configuration supports this?

  1. Set `ip address 0.0.0.0 255.255.255.0` as a static WAN interface.
  2. Enable an OSPF network statement with the ISP subnet mask.
  3. Configure `ip address dhcp` on the appropriate routed interface.
  4. Configure `ip helper-address` on the ISP interface as the only address command.

Explanation

Correct Answer

C:

IOS can request an IPv4 lease for an interface by using the DHCP client configuration instead of a manually assigned static address. The ISP DHCP server returns the permitted address and other options subject to provider behavior. This is distinct from running a DHCP server for LAN clients or relaying broadcasts between unrelated subnets.

Incorrect Answers

A:

Assigning an all-zero IPv4 address with an ordinary mask is not the supported way to receive a dynamic ISP lease. The router must invoke the DHCP client exchange.

B:

OSPF exchanges routes but does not acquire the interface’s IPv4 address through DHCP. The interface needs the DHCP addressing command.

D:

A helper relays other hosts’ DHCP requests to a server; it does not turn the router interface into an address-leasing DHCP client. `ip address dhcp` supplies the client role.

Question 433

An interface intended to acquire an IPv4 address dynamically from a service provider shows `unassigned` and line protocol up. The provider reports that DHCP requests are reaching the gateway but no usable reply arrives. Which next check distinguishes DHCP service from link state?

  1. Inspect DHCP client exchange and lease state on the WAN interface, including any server rejection or relay/network filtering.
  2. Assign a random public IP in the ISP subnet without provider authorization.
  3. Enable OSPF passive-interface on the WAN to force the DHCP server to respond.
  4. Treat an up/up interface as proof that DHCP has assigned the address successfully.

Explanation

Correct Answer

A:

Line protocol up confirms a working link state but does not prove successful DHCP address negotiation. IOS must receive an acceptable offer and acknowledgement to install a leased address. Capture or inspect the client’s request/offer sequence and verify provider-side authorization or filtering rather than assuming the interface is configured with a valid IPv4 route.

Incorrect Answers

B:

An arbitrary address may conflict with another subscriber and bypass assigned DHCP policy. The source of the missing lease must be determined instead of guessing external address assignments.

C:

OSPF neighbor behavior and DHCP message delivery are separate protocol functions. Passive-interface does not make a DHCP server acknowledge a lease request.

D:

The physical and data-link states can be healthy while the DHCP exchange fails. The IP configuration remains unassigned until an acceptable lease completes.

Question 434

A provider contract caps outbound traffic at a specific average rate. The network must smooth traffic bursts by buffering and delaying excess frames when possible, not immediately dropping every burst. Which QoS behavior fits?

  1. Ingress policing configured to drop all packets above the rate immediately.
  2. Changing the DNS A record TTL to the provider rate.
  3. Adding a second default static route without QoS.
  4. Traffic shaping at the egress interface with an appropriate configured rate.

Explanation

Correct Answer

D:

Traffic shaping regulates output rate by buffering eligible excess traffic and transmitting it later, helping smooth bursts to a contract rate. It consumes queue memory and introduces delay; not every latency-sensitive application tolerates aggressive shaping. Policing is distinct because it commonly drops or remarks traffic exceeding a threshold instead of smoothing it.

Incorrect Answers

A:

Policing enforces a rate by dropping or remarking nonconforming traffic rather than buffering the excess for later transmission. That conflicts with the requested smoothing.

B:

DNS TTL controls name-record cache lifetime, not packet transmission rate. It cannot shape an egress queue.

C:

Routes choose next hops and do not impose an average traffic rate on a particular interface. The requested regulation requires QoS treatment.

Question 435

A router sees voice and backup traffic competing for one slow uplink. Which QoS phase distinguishes which flows belong to different classes before queue policy is applied?

  1. DNS recursion that resolves both applications to IP addresses.
  2. An OSPF DR election on the uplink.
  3. A MAC table aging timer to remove unused hosts.
  4. Traffic classification using protocol, port, DSCP or other supported match criteria.

Explanation

Correct Answer

D:

Classification groups packets according to configured characteristics so later marking, queuing or policing can apply different handling. Accurate class match rules are essential; otherwise a priority policy may favor the wrong application. Classification is not itself a guarantee of bandwidth, because the forwarding scheduler or meter supplies the actual per-hop treatment.

Incorrect Answers

A:

Name resolution helps applications find servers, but it does not classify queued packets by traffic policy. The router needs packet match criteria.

B:

OSPF DR election applies to routing adjacencies on broadcast networks, not traffic class recognition. It cannot define per-class queue behavior.

C:

Bridge aging maintains destination-port associations and does not categorize voice versus backup packets for QoS. It is a forwarding database operation.

Question 436

A WAN provider uses DSCP to recognize real-time voice traffic. An access switch must identify these packets and set an appropriate class marking before the WAN router queues them. Which QoS operations are involved?

  1. Only increase the switch native VLAN number.
  2. Use an IP default route as the packet’s DSCP field.
  3. Only change the DNS resolver for handsets.
  4. Classify matching voice traffic and mark its packets with the approved QoS value.

Explanation

Correct Answer

D:

Classification identifies traffic through supported fields or policy criteria, while marking writes the selected DSCP or Layer 2 priority value into packets. Downstream devices can use that marking in their queuing or congestion policies. The marking does not by itself reserve bandwidth, so the end-to-end per-hop behavior must remain consistent.

Incorrect Answers

A:

A VLAN ID determines Layer 2 segment association and does not automatically identify voice payloads or set DSCP. QoS classification and marking must be configured explicitly.

B:

Routing selects a next hop by destination prefix; the QoS marking is a separate header field. A default route cannot label a voice class.

C:

Name resolution can help phones locate services but does not assign QoS classes to their data packets. The requirement is traffic treatment.

Question 437

A security policy demands that traffic above a prescribed rate be immediately dropped or remarked at an ingress boundary rather than delayed in a buffer. Which QoS function is appropriate?

  1. An ACL that only permits matching source addresses.
  2. A static route whose metric equals the bandwidth cap.
  3. Traffic policing with a configured meter and exceed action.
  4. Egress shaping that buffers all bursts for later transmission.

Explanation

Correct Answer

C:

Policing measures traffic against a configured token or rate allowance and applies conform/exceed actions such as forwarding, dropping or remarking. It is suited to enforcement where delayed transmission is not the goal. Shaping instead buffers eligible traffic for later egress service and therefore does not implement immediate ingress violation action.

Incorrect Answers

A:

An ACL controls packet access by header predicates but does not by itself meter throughput over time. Policing adds rate-dependent action.

B:

Route metrics select forwarding paths; they do not regulate bits per second. A numerical route metric is not a traffic policer.

D:

The policy forbids buffering excess traffic and requires immediate violation handling. Shaping’s delay mechanism is a different behavior.

Question 438

A WAN interface is congested. Voice must receive preferential forwarding while bulk transfers remain best effort. Which QoS feature controls how queued packets are scheduled for transmission?

  1. Apply NAT overload instead of a queue policy.
  2. A supported priority/weighted queuing policy applied at the egress interface.
  3. Only set every packet DSCP to the same value.
  4. Configure DHCP helper addresses on the WAN.

Explanation

Correct Answer

B:

Egress queuing selects which packets leave a congested interface and in what service order. A priority or class-based scheduler can protect delay-sensitive traffic if properly provisioned. Classification and marking indicate packet class, but without a queuing decision the required preferential transmission is not guaranteed.

Incorrect Answers

A:

PAT translates source IP and port tuples but does not inherently prioritize traffic during congestion. It solves address conservation rather than egress scheduling.

C:

Identical markings remove traffic differentiation and do not establish an egress scheduler. The router still needs a policy deciding which class is served first.

D:

DHCP relay transports address requests; it does not choose packet service order on the congested egress link.

Question 439

A Cisco IOS device is configured for SSH but cannot generate its RSA host key because no required domain name is set on the platform. What prerequisite is relevant?

  1. Configure the supported device hostname and IP domain name, then generate appropriate crypto key material.
  2. Enable Telnet so the device can generate SSH keys.
  3. Create an additional 802.1Q VLAN with the domain name as its ID.
  4. Lower OSPF interface cost to zero.

Explanation

Correct Answer

A:

On common IOS SSH workflows, an RSA key pair is generated using device identity parameters that require a configured hostname and domain name. Once a supported key exists, enable the correct SSH version and login settings. A management IP address alone does not always satisfy the key-generation prerequisites.

Incorrect Answers

B:

Telnet is an unencrypted management transport and is not a prerequisite for cryptographic key creation. It does not supply the missing domain identity.

C:

VLAN IDs are numeric Layer 2 segments and cannot substitute for `ip domain-name` in key generation. The issue is SSH crypto identity.

D:

OSPF cost affects routing preference, not the RSA key subsystem. Key-generation failure requires local crypto prerequisites.

Question 440

SSH login to a device works from the operations subnet but fails from the guest subnet; the management ACL intentionally permits only operations addresses. Which conclusion follows?

  1. SSH must be disabled because one routed subnet cannot connect.
  2. The guest VLAN must be reconfigured as the native VLAN for SSH to work.
  3. The SSH service is reachable, and the source ACL correctly denies unauthorized guest management attempts.
  4. Every subnet should be allowed to administer the device by default.

Explanation

Correct Answer

C:

A management-plane ACL can restrict which source IPs are allowed to initiate SSH even when the destination address and port are reachable through routing. Success from an authorized subnet and rejection from an unauthorized guest segment are consistent with least-privilege policy. Do not weaken the ACL solely to make guest attempts succeed.

Incorrect Answers

A:

A successful operations-subnet connection proves the SSH service is functioning. The differing outcome is explained by the approved source restriction.

B:

VLAN tagging is not the specified source-ACL authorization condition. Reassigning VLANs would undermine segmentation instead of respecting the policy.

D:

Management access should be limited to authorized sources. Opening SSH to guest networks would violate the explicit security design.