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Cisco 200-301 Practice Test 54

Question 530

A branch router already has inside/outside interface roles and standard ACL 10 matching authorized inside hosts. The WAN interface is GigabitEthernet0/0 with one provider global IPv4 address. Which global IOS command lets multiple inside clients share that interface address using TCP/UDP port translations?

  1. ip nat inside source list 10 interface GigabitEthernet0/0 overload
  2. ip nat inside source list 10 pool POOL without overload
  3. ip nat inside source static 10.1.1.10 203.0.113.10
  4. no ip nat inside on the LAN interface

Explanation

Correct Answer

A:

Inside-source PAT with the `overload` keyword can multiplex multiple inside flows through the WAN interface address using transport-port identifiers.

Incorrect Answers

B:

Dynamic pool NAT without overloading assigns global address translations but does not explicitly reuse one interface address with transport-port multiplexing.

C:

A static one-to-one mapping binds one inside host to one global address and does not supply generalized PAT for many users.

D:

Removing the inside role would prevent normal inside-source NAT for that LAN, not enable shared overload.

Question 531

An inside-source NAT translation records inside local `10.10.1.20` and inside global `203.0.113.20` for one LAN host. Which value is the inside-local address as seen inside the organization?

  1. 203.0.113.20, which is the publicly represented inside-global address
  2. 192.0.2.9, the remote web server’s outside-global destination
  3. The translated TCP source port rather than either IPv4 address
  4. Read the original private inside-host IPv4 address

Explanation

Correct Answer

D:

The original RFC1918 source address 10.10.1.20 is the inside-local address, the value that identifies the inside host before translation.

Incorrect Answers

A:

This is the inside-global value shown to the outside; it is not the original local inside-host address.

B:

An external destination address is not the internal source host address named by the inside-local NAT term.

C:

PAT may also change a transport port, but inside-local identifies an IP address field, not an individual port.

Question 532

A NAT table shows a private host `10.10.1.20` translated to `203.0.113.20` when contacting an Internet server. Which address is the inside-global representation of that inside host?

  1. 10.10.1.20, the untranslated inside-local address
  2. The external server’s outside-global destination address
  3. The router’s inside interface subnet mask
  4. Read the address representing the inside host to the outside

Explanation

Correct Answer

D:

The inside-global address is the value by which outside peers see the inside host; here it is the translated address 203.0.113.20, not 10.10.1.20.

Incorrect Answers

A:

That is the inside-local source used within the organization, not the globally represented value shown after NAT.

B:

An outside-global address identifies the destination host outside, rather than the translated representation of the inside source.

C:

A subnet mask is not the translated IP address that NAT assigns as the host’s inside-global identity.

Question 533

A service at inside-local IPv4 10.10.1.20 must always be represented to external clients by one fixed inside-global IPv4 203.0.113.20. Which NAT method supplies the required persistent one-to-one address translation?

  1. Dynamic inside-source NAT with an address pool, where the outside identity can change after leases
  2. PAT overload using one interface address and translated TCP/UDP ports for many hosts
  3. Policy-based routing to the ISP without any packet-source translation
  4. A static inside-source NAT mapping from 10.10.1.20 to 203.0.113.20

Explanation

Correct Answer

D:

Static inside-source NAT creates a persistent correspondence between the private inside-local address and a chosen inside-global external address for that server.

Incorrect Answers

A:

Dynamic NAT maps internal addresses from a pool as needed and does not inherently guarantee the permanent fixed pair required here.

B:

PAT can share a single public address across many clients by using unique transport ports; it is not the specified dedicated one-to-one address identity.

C:

Routing decides where a packet goes, not how its inside-local source IPv4 becomes the fixed inside-global address visible to outside peers.

Question 534

Hundreds of inside clients need temporary external addresses allocated from a public IPv4 pool. The company explicitly does not want static assignments or PAT port sharing, and it accepts that pool exhaustion limits simultaneous mappings. Which NAT behavior is intended?

  1. Static NAT mapping one private server to a permanent public address
  2. Interface overload PAT mapping many clients to one address with distinct transport ports
  3. No translation, forwarding RFC1918 source addresses directly onto the public ISP path
  4. Dynamic inside-source NAT allocating addresses from the configured pool

Explanation

Correct Answer

D:

Dynamic inside-source NAT selects external IPv4 addresses from a configured pool for qualifying internal sources; active mappings consume pool addresses until available again.

Incorrect Answers

A:

Static one-to-one translations are permanent address bindings and do not dynamically lease pool identities across changing clients.

B:

PAT uses port identifiers to let many inside hosts share one/few external IPv4 addresses; the task explicitly requests pool-address allocation without overload.

C:

Untranslated private IPv4 source addresses are not the requested externally translated addresses and typically cannot traverse the public Internet as such.

Question 535

A host can reach the WAN interface but its outbound NAT traffic is still failing. Which two independent checks distinguish missing translations from missing route reachability?

  1. Read only the Gi0/1 input error counter and assume NAT is correct
  2. Reboot the NAT router without examining translations or destination routes
  3. Check DNS A records exclusively, ignoring translated packets and IPv4 routing
  4. Check NAT translations and routing independently

Explanation

Correct Answer

D:

Translation correctness cannot compensate for absent routing or external return reachability.

Incorrect Answers

A:

A healthy physical link does not prove a valid translation was allocated or a route exists to the outside destination.

B:

Restarting the device is disruptive and does not isolate either translation policy failure or route reachability.

C:

Name resolution alone cannot determine why already addressed outbound NAT traffic is not forwarded.

Question 536

An IOS router should synchronize its system time from reachable NTP server 192.0.2.25 rather than operate as an unsynchronized local clock. Which global NTP client statement configures this peer?

  1. Use clock set manually and leave NTP server configuration absent
  2. Use ntp master and advertise this unsynchronized router as the source
  3. Configure ntp server 192.0.2.25
  4. Use show ntp status as a replacement for configuring the server

Explanation

Correct Answer

C:

`ntp server 192.0.2.25` specifies a reachable external NTP source for this router. Synchronization depends on network reachability and valid NTP exchanges, and can be checked in the operational NTP status.

Incorrect Answers

A:

A manually set time is not continuous time synchronization to the designated NTP server.

B:

NTP master can create a local reference service; it does not configure this device as a client of 192.0.2.25.

D:

The show command reads current synchronization state but cannot establish the requested NTP client association.

Question 537

The router's time appears wrong after NTP configuration, and an operator needs the list of peers, reach counters and selected association marker. Which NTP show command provides this view?

  1. Run show clock detail and infer NTP peer reach counters from wall time
  2. Run show ntp associations
  3. Run show ntp status only, without displaying the peer association list
  4. Reconfigure ntp server repeatedly until the displayed wall clock changes

Explanation

Correct Answer

B:

`show ntp associations` displays known NTP peers or servers and selection/reachability information. Checking associations distinguishes a configured source that is actually participating from one with no usable timing samples.

Incorrect Answers

A:

The clock output can show time source but lacks the full association table and its reach/selection markers.

C:

NTP status summarizes overall synchronization, but diagnosing individual peers requires their association details and reach registers.

D:

Configuration changes do not provide the read-only peer reachability and selection details requested.

Question 538

A central syslog collector sees timestamps drift. The operator wants a summary of whether the router's NTP clock is synchronized, its stratum and reference source. Which status command is most direct?

  1. Run show ntp status
  2. Run show clock detail and treat local date display as proof of synchronized NTP stratum
  3. Run show ntp associations and read only the configured peer names
  4. Set clock timezone and assume it fixes clock synchronization drift

Explanation

Correct Answer

A:

`show ntp status` reports the local NTP synchronization state and timing hierarchy, such as stratum, rather than just listing configured peer addresses.

Incorrect Answers

B:

A clock reading is not sufficient evidence of NTP synchronization status, stratum and reference ID.

C:

Associations help with peer status, but show ntp status gives the concise overall synchronized/stratum/reference report requested.

D:

Timezone controls local presentation, not NTP synchronization correctness or source stratum.

Question 539

A Cisco IOS router reports an NTP association to 192.0.2.25, and the operator wants to inspect the currently displayed local calendar date, time and source detail after synchronization. Which command is most direct?

  1. show ntp associations, which lists server selection and reach but not a formatted local clock readout
  2. show clock detail, which displays the local time and additional source information
  3. ntp server 192.0.2.25, which adds a time reference rather than displays the current clock
  4. show ip route ospf, which lists dynamically installed IPv4 routes

Explanation

Correct Answer

B:

The clock detail command shows the current local system time, with additional context about the clock source when supported.

Incorrect Answers

A:

Association output helps explain NTP peer reachability; it is not the primary display of the local device’s current wall-clock value.

C:

The NTP server command configures an upstream time source; it does not answer the current local-time inspection question.

D:

OSPF route output describes packet-forwarding reachability and route preferences, not the calendar time maintained by the local operating-system clock.

Question 540

An IOS router is synchronized to UTC by NTP, but a field team wants log timestamps displayed in Pakistan Standard Time (UTC+5) without altering the NTP reference. What should the engineer change?

  1. The time-zone display setting, leaving NTP synchronization intact
  2. The NTP reference IP address to a server physically located in Pakistan
  3. The device routing-table administrative distance for the NTP server
  4. The interface duplex mode, since syslog timestamps use link speed

Explanation

Correct Answer

A:

Clock timezone formatting is separate from UTC synchronization; an IOS time-zone setting changes presentation without requiring a different NTP source.

Incorrect Answers

B:

NTP time synchronization does not depend on selecting a server in the desired civil time zone.

C:

Administrative distance affects route preference and does not specify the time-zone offset applied to displayed timestamps.

D:

Duplex mismatch affects Ethernet transmission, not the time offset used by the device clock formatting.

Cisco Certified Network Associate (CCNA) (200-301) Practice Tests

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