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Cisco 200-301 Practice Test 10

Question 90

A diagnostic process must send local-only IPv4 traffic to its own host stack without traversing any Ethernet port. Which reserved IPv4 network is the loopback family?

  1. 127.0.0.0/16, a subset that omits most of the special loopback allocation
  2. 127.0.0.0/8 IPv4 loopback space
  3. 169.254.0.0/16, IPv4 link-local autoconfiguration on one Ethernet
  4. 0.0.0.0/0, the catch-all IPv4 routing default prefix

Explanation

Correct Answer

B:

127.0.0.0/8 is reserved for host-local loopback, not for routing between private LAN devices. Packets addressed to loopback remain on the originating host and do not represent a reachable enterprise subnet.

Incorrect Answers

A:

The reserved loopback family is 127.0.0.0/8, not only one /16 within it.

C:

Link-local is for on-link communication, not the local host’s loopback 127/8 destination family.

D:

The all-zero /0 route covers arbitrary network destinations rather than the loopback-reserved /8 block.

Question 91

A host interface is assigned 10.208.7.14/24. Which IPv4 classification applies specifically to this address under the reserved ranges, independently of whether it can be routed inside the enterprise?

  1. RFC1918 private IPv4 unicast in 10.0.0.0/8
  2. RFC 6598 shared carrier address space in 100.64.0.0/10
  3. IPv4 link-local autoconfiguration space in 169.254.0.0/16
  4. TEST-NET-2 documentation space in 198.51.100.0/24

Explanation

Correct Answer

A:

10.208.7.14 falls within the entire 10.0.0.0/8 RFC1918 private prefix; the /24 interface mask does not change its reserved address classification.

Incorrect Answers

B:

Carrier shared space starts at 100.64.0.0/10, not at a 10.x address.

C:

Automatic IPv4 link-local addresses use 169.254.0.0/16 and do not include 10.208.7.14.

D:

TEST-NET-2 contains 198.51.100.0/24 for documentation rather than the assigned 10.x address.

Question 92

A Linux server is assigned 172.27.5.19/24. Which IPv4 reserved-address category contains this address, considering the entire RFC1918 allocation rather than only the local /24 subnet?

  1. RFC 6598 shared address space 100.64.0.0/10
  2. IPv4 link-local space 169.254.0.0/16
  3. RFC1918 private unicast 172.16.0.0/12
  4. RFC 5737 documentation space 203.0.113.0/24

Explanation

Correct Answer

C:

172.27.5.19 lies between 172.16.0.0 and 172.31.255.255, the RFC1918 private /12 allocation.

Incorrect Answers

A:

Shared address space is distinct from RFC1918 and does not include 172.27.5.19.

B:

Link-local IPv4 169.254.0.0/16 is unrelated to this configured 172.27 address.

D:

The TEST-NET-3 documentation prefix has no overlap with 172.27.5.19.

Question 93

A branch router receives WAN address 100.100.24.17 from its ISP, which performs carrier-grade NAT. Which classification correctly distinguishes this WAN space from ordinary RFC 1918 private addressing?

  1. A globally routable public IPv4 allocation that requires no provider NAT
  2. A member of the RFC 1918 10.0.0.0/8 enterprise-private block
  3. RFC 6598 shared address space 100.64.0.0/10, commonly used between customers and CGNAT providers
  4. A member of the 169.254.0.0/16 IPv4 link-local autoconfiguration block

Explanation

Correct Answer

C:

100.64/10 spans 100.64.0.0 through 100.127.255.255. It is shared ISP-side address space for CGNAT, not one of the three RFC 1918 blocks.

Incorrect Answers

A:

The 100.100.24.17 address falls in shared space, not an ordinary globally advertised IPv4 range; provider NAT can be needed for Internet egress.

B:

RFC 1918 10/8 covers only 10.0.0.0–10.255.255.255. The distinct 100.64/10 block comes from RFC 6598.

D:

IPv4 link-local uses 169.254.0.0/16. Both blocks are nonpublic, but their allocation purposes and numeric ranges differ.

Question 94

After DHCP fails, a workstation autonomously chooses 169.254.81.9/16 for communication on its local Ethernet. Which IPv4 address class and forwarding scope does this represent?

  1. IPv4 link-local (169.254.0.0/16), usable on the attached link but not routed between subnets
  2. RFC1918 private 10.0.0.0/8, routinely routed between enterprise LANs
  3. RFC6598 shared carrier space 100.64.0.0/10, intended for CGNAT deployments
  4. Documentation-only TEST-NET-2 198.51.100.0/24, reserved for network examples

Explanation

Correct Answer

A:

169.254.81.9 is inside the IPv4 link-local 169.254.0.0/16 range often used for autoconfiguration; routers must not forward this link-scope traffic.

Incorrect Answers

B:

10/8 is private-use enterprise unicast space, but the example begins with 169.254 and therefore is not an RFC1918 10/8 address.

C:

100.64/10 is the provider shared-address range; its numeric allocation and CGNAT role differ from link-local 169.254/16.

D:

198.51.100/24 is reserved for documentation, not the assigned 169.254 address or its local-only automatic addressing role.

Question 95

An example CLI snippet contains 198.51.100.22/24. Which special-use IPv4 allocation explains why this host must not be treated as a customer's public production address?

  1. RFC1918 192.168.0.0/16 private-use addressing
  2. IPv4 link-local 169.254.0.0/16 for same-link autoconfiguration
  3. TEST-NET-2 198.51.100.0/24 reserved for documentation examples
  4. Shared provider-use 100.64.0.0/10 for carrier NAT infrastructure

Explanation

Correct Answer

C:

RFC5737 reserves 198.51.100.0/24 as TEST-NET-2 for documentation; 198.51.100.22 is inside it and should not represent a real customer allocation.

Incorrect Answers

A:

RFC1918 private /16 addresses start with 192.168, not 198.51.100, and are defined for private enterprise internetworks.

B:

IPv4 link-local addresses start with 169.254 and stay on one connected segment; they do not explain the example's prefix.

D:

The RFC6598 shared range occupies 100.64.0.0/10; it is not the 198.51.100.0/24 documentation block.

Question 96

An IOS XE practice lab uses the reserved IPv6 documentation prefix 2001:db8:50:1::/64. The router interface should be assigned 2001:db8:50:1::1 with a /64 prefix for local lab tests; no public Internet reachability is claimed. Which interface command does this?

  1. ipv6 address 2001:db8:50:1::1/64
  2. ip address 2001:db8:50:1::1 255.255.255.0
  3. ipv6 route 2001:db8:50:1::1/64
  4. ipv6 address fe80::1/64 link-local

Explanation

Correct Answer

A:

Under interface configuration, `ipv6 address` accepts an IPv6 address and prefix length and assigns this lab-only global-unicast-form example.

Incorrect Answers

B:

The IPv4 `ip address` form cannot assign an IPv6 address or use an IPv4 dotted mask for the IPv6 lab subnet.

C:

A static-route statement installs reachability information rather than assigning the requested address to the interface.

D:

A link-local configuration gives a different, link-scoped address; it does not assign 2001:db8:50:1::1.

Question 97

An IPv6 router is already connected to host VLAN 50 and has a valid 2001:db8:50:1::/64 test prefix. SLAAC hosts must learn an on-link prefix and default-router information via RA. Which router forwarding/advertisement capability is required?

  1. Enable IPv6 routing and send router advertisements
  2. Enable only a stateful DHCPv6 address pool and suppress router advertisements
  3. Configure IPv4 ip helper-address and expect hosts to learn IPv6 RA prefixes
  4. Enable the interface only for IPv6 link-local traffic and disable sending RAs

Explanation

Correct Answer

A:

IPv6 router advertisements carry network prefixes and default-router information so SLAAC hosts can form addresses and discover a gateway. DHCPv6 alone does not supply the router’s default route, so RA behavior remains important.

Incorrect Answers

B:

DHCPv6 can allocate addresses, but SLAAC on-link prefix and default-router discovery require RA behavior.

C:

An IPv4 DHCP relay helper does not transmit ICMPv6 router advertisements or IPv6 default-router information.

D:

Link-local connectivity by itself does not advertise the /64 autonomous prefix and router lifetime to SLAAC hosts.

Question 98

A technician wants a concise read-only listing of a Cisco router's IPv6 interface addresses and their administratively/operationally reported states. Which show command directly provides that overview?

  1. Run show ipv6 neighbors to list all ND cache entries
  2. show ipv6 interface brief
  3. Run show ipv6 route to list IPv6 installed prefixes
  4. Run show ipv6 interface GigabitEthernet0/0 detail for only one port

Explanation

Correct Answer

B:

`show ipv6 interface brief` lists interface IPv6 addresses and operational status without modifying their configurations. It is the concise way to spot a missing assigned address or an interface that is not up.

Incorrect Answers

A:

Neighbor Discovery shows learned on-link peer mappings, not the router’s own interface addresses and up/down states.

C:

Routing entries give destination/next-hop information but not a concise overview of every local IPv6 interface address/status.

D:

Detailed output for one interface is not the requested concise summary for all interfaces.

Question 99

Two lab interfaces share an IPv6 test prefix; one interface is 2001:db8:50:1::2. The technician needs to send an ICMPv6 Echo Request from IOS to that exact peer, not display a route table. Which command should be used?

  1. ping ipv6 2001:db8:50:1::2
  2. Run show ipv6 route 2001:db8:50:1::2 to inspect a route without sending packets
  3. Run ping 192.0.2.2 to test an unrelated IPv4 endpoint
  4. Run show ipv6 neighbors to list link-layer mappings only

Explanation

Correct Answer

A:

An IPv6 echo request tests reachability to the chosen neighbor address and expects an ICMPv6 echo reply. This is an operational probe; an `ipv6 address` command would instead change the local interface configuration.

Incorrect Answers

B:

A route lookup is read-only and does not transmit the required ICMPv6 echo request.

C:

The destination is IPv6 2001:db8:50:1::2, so a ping to IPv4 cannot prove its reachability.

D:

Neighbor cache inspection is not an active ICMPv6 echo probe to the exact remote address.

Question 100

A router must display *installed IPv6 destination prefixes* and their next hops, rather than its neighbor cache or interface address summary. Which operational command meets that request?

  1. Run show ipv6 interface brief and infer installed remote prefixes from assigned addresses
  2. Run show ipv6 neighbors to retrieve remote route metrics
  3. Run show ipv6 protocols to display all next-hop route entries
  4. show ipv6 route

Explanation

Correct Answer

D:

`show ipv6 route` displays the router’s installed IPv6 routing information, including connected and learned prefixes. An interface summary can show addresses but not the complete collection of next-hop route entries.

Incorrect Answers

A:

Interface addresses indicate local configuration, not all connected and learned IPv6 destination routes.

B:

Neighbor cache contains local-link peers and link-layer mappings, not the complete IPv6 routing table.

C:

Protocol state does not directly enumerate all installed IPv6 destination routes and resolved next hops.

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

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