Network Infrastructure and Connectivity practice questions

Only a DNS reply

Why it fails: DNS does not provide the Layer 3 prefix needed for SLAAC.

An ARP reply from the default gateway

Why it fails: ARP is an IPv4 mechanism and not used in IPv6 the same way.

A VTP summary advertisement

Why it fails: VTP has nothing to do with IPv6 host addressing.

To encrypt every frame before transmission

Why it fails: Encryption may occur, but it is not the general purpose of encapsulation.

To remove all addressing information before forwarding

Why it fails: Encapsulation adds, not removes, addressing and control information.

To convert unicast traffic into broadcast traffic

Why it fails: Encapsulation is not a broadcast mechanism.

It is publicly routable across the Internet.

Why it fails: This is wrong because link-local addresses are not Internet-routable. That is one of the defining features of the address type.

It replaces the need for a default gateway on IPv6 hosts.

Why it fails: This is wrong because IPv6 hosts still rely on a default route or default-router information to reach off-link destinations.

It is used only when DHCPv6 fails.

Why it fails: This is wrong because link-local addresses are normal in IPv6, not something used only after DHCPv6 fails.

10.1.1.192 to 10.1.1.223

Why it fails: This is wrong because those include the network and broadcast addresses.

10.1.1.194 to 10.1.1.223

Why it fails: This is wrong because it excludes one valid host and includes the broadcast address.

10.1.1.160 to 10.1.1.191

Why it fails: This is wrong because that range belongs to a different /27 subnet.

It is the public IPv6 address used for Internet reachability.

Why it fails: This is wrong because public global reachability uses global unicast addresses, not link-local addresses.

It is used only when DHCPv6 fails.

Why it fails: This is wrong because link-local addressing is normal IPv6 behavior, not a fallback error condition.

It replaces the need for a default gateway.

Why it fails: This is wrong because hosts still need next-hop routing information for off-link traffic.

A MAC address is used only by routers, while an IP address is used only by switches.

Why it fails: This is wrong because it reverses and oversimplifies the actual roles.

MAC and IP addresses are interchangeable in routed networks.

Why it fails: This is wrong because they serve different layers and purposes.

IP addresses are used only inside one Ethernet broadcast domain.

Why it fails: This is wrong because IP addresses are used across routed networks.

It can be used only on the local link and is never routed.

Why it fails: This is wrong because that describes link-local scope.

It is used only for loopback testing inside a device.

Why it fails: This is wrong because that describes the loopback address, not global unicast.

It is created only when EUI-64 is disabled.

Why it fails: This is wrong because global unicast addressing is not dependent on that condition.

The default gateway replaces the need for the subnet mask.

Why it fails: This is wrong because the host still needs the mask to determine local versus remote scope.

The subnet mask is used only by routers, not by hosts.

Why it fails: This is wrong because hosts use the subnet mask directly.

The default gateway is used only for broadcast traffic.

Why it fails: This is wrong because the gateway is used for off-subnet forwarding, not just broadcast.

It is the protocol used to summarize routes between OSPF areas.

Why it fails: This is wrong because Neighbor Discovery is not a route summarization mechanism.

It is a wireless security standard replacing WPA3.

Why it fails: This is wrong because Neighbor Discovery is not a WLAN security protocol.

It is the SNMP method for polling interface counters.

Why it fails: This is wrong because SNMP polling and IPv6 Neighbor Discovery are different technologies.

It encrypts the packet before it reaches the gateway.

Why it fails: This is wrong because subnet masks do not provide encryption.

It chooses the wireless SSID for the host.

Why it fails: This is wrong because SSID selection is unrelated to subnet masks.

It automatically creates a route summarization policy.

Why it fails: This is wrong because subnet masks on hosts do not create routing policy.

Because the subnet mask is used only by switches, not hosts.

Why it fails: This is wrong because hosts absolutely use the subnet mask.

Because the mask automatically provides DNS name resolution.

Why it fails: This is wrong because DNS and subnet masks solve different problems.

Because the subnet mask replaces the need for a default gateway.

Why it fails: This is wrong because the mask and gateway serve different purposes.

Because global unicast addresses can be used only on serial links.

Why it fails: This is wrong because global unicast addresses are broadly used across IPv6 networks.

Because link-local addresses replace all static routes.

Why it fails: This is wrong because local addresses and route configuration solve different problems.

Because link-local addresses are the same thing as DNS names.

Why it fails: This is wrong because addressing and name resolution are different concepts.

It is the hostname of the DNS server.

Why it fails: This is wrong because DNS and default gateways serve different functions.

It is the broadcast address for the subnet.

Why it fails: This is wrong because the broadcast address is not the router next hop.

It is the same thing as the subnet mask.

Why it fails: This is wrong because a subnet mask and default gateway are different configuration elements.

Because the subnet mask is what resolves hostnames into IP addresses.

Why it fails: This is wrong because DNS resolves names, not subnet masks.

Because the subnet mask replaces the default gateway for all remote traffic.

Why it fails: This is wrong because remote traffic still relies on the gateway.

Because the subnet mask is required only by switches, not hosts.

Why it fails: This is wrong because hosts use subnet masks directly.

Because DNS automatically replaces the need for any gateway.

Why it fails: This is wrong because DNS does not forward packets.

Because a wrong gateway changes the hostname of the server.

Why it fails: This is wrong because gateway configuration does not alter hostnames.

Because hosts use the default gateway only for local traffic.

Why it fails: This is wrong because the default gateway is for off-subnet traffic.

It maps a MAC address to a DNS hostname

Why it fails: Distractor.

It advertises routes between routers

Why it fails: Distractor.

It negotiates trunk encapsulation between switches

Why it fails: Distractor.

It assigns IP addresses dynamically to the host

Why it fails: That is the role of DHCP.

It resolves hostnames into IP addresses

Why it fails: That is the role of DNS.

It encrypts traffic between hosts

Why it fails: A gateway forwards packets; encryption is a separate function.

Neighbor Solicitation

Why it fails: NS is used for address resolution and neighbor discovery functions, not for advertising the default gateway.

DHCPv6 Solicit

Why it fails: SLAAC does not rely on DHCPv6 for default-gateway information.

ICMP Echo Reply

Why it fails: Echo messages do not advertise prefixes or gateways.

A logical grouping of ports that isolates broadcast domains within a switch

Why it fails: This describes a VLAN, not a MAC address. VLANs segment broadcast domains at Layer 2, while MAC addresses are hardware identifiers.

A link that carries traffic for multiple VLANs using 802.1Q tagging

Why it fails: This describes a trunk link, not a MAC address. Trunks use 802.1Q encapsulation to carry multiple VLANs.

A protocol that prevents loops in a redundant switched network

Why it fails: This describes Spanning Tree Protocol (STP), not a MAC address. STP prevents loops by blocking redundant paths.