300-410 Practice Test 8 — 10 Questions

Question 1

A network engineer runs the following command to troubleshoot DHCPv6 relay on router R1:

R1# debug ipv6 dhcp relay

Output:
 IPv6 DHCP relay: Received SOLICIT message from FE80::1 on GigabitEthernet0/0
 IPv6 DHCP relay: Forwarding SOLICIT to server 2001:DB8:2::1 via GigabitEthernet0/1
 IPv6 DHCP relay: Received ADVERTISE message from server 2001:DB8:2::1 via GigabitEthernet0/1
 IPv6 DHCP relay: Forwarding ADVERTISE to client FE80::1 via GigabitEthernet0/0
 IPv6 DHCP relay: Received REQUEST message from FE80::1 on GigabitEthernet0/0
 IPv6 DHCP relay: Forwarding REQUEST to server 2001:DB8:2::1 via GigabitEthernet0/1
 IPv6 DHCP relay: Received REPLY message from server 2001:DB8:2::1 via GigabitEthernet0/1
 IPv6 DHCP relay: Forwarding REPLY to client FE80::1 via GigabitEthernet0/0

What does this output indicate?

Accepted Answer

The DHCPv6 relay agent is successfully forwarding messages between the client and server.. The debug output shows a DHCPv6 relay agent successfully forwarding messages between a client and a server. The relay receives SOLICIT and REQUEST from the client on GigabitEthernet0/0 and forwards them to the server at 2001:DB8:2::1 via GigabitEthernet0/1, then forwards the ADVERTISE and REPLY back.

Answer

The DHCPv6 relay agent is not functioning because messages are not being forwarded.

Answer

The DHCPv6 server is unreachable because no REPLY is received.

Answer

The DHCPv6 client is using a global unicast address as its link-local address.

Question 2

A network engineer runs the following command to verify DHCPv4 pool configuration on router R1:

R1# show ip dhcp pool DHCP_POOL

Output:
 Pool DHCP_POOL :
   Utilization mark (high/low)    : 100 / 0
   Subnet size (first/next)       : 0 / 0
   Total addresses                : 254
   Leased addresses               : 100
   Pending event                  : none
   1 subnet is currently in the pool :
   Current index        IP address range                    Leased addresses
   192.168.1.1          192.168.1.1 - 192.168.1.254         100

What does this output indicate?

Accepted Answer

The DHCP pool has 254 addresses available, and 100 are currently leased.. The show ip dhcp pool command displays pool details. This pool has 254 total addresses, with 100 currently leased. The current index shows the next address to be assigned (192.168.1.1, but this is the start of the range; the actual next assignment may be tracked differently).

Answer

The DHCP pool is exhausted because 100 addresses are leased.

Answer

The DHCP server is using a database agent to store leases.

Answer

The DHCP pool has a utilization mark of 100%, meaning it is full.

Question 3

What is the default DHCPv4 server lease time on a Cisco IOS-XE router configured as a DHCP server?

Accepted Answer

86400 seconds (1 day). Cisco IOS-XE DHCP server defaults to a lease time of 86400 seconds (1 day) unless explicitly configured otherwise.

Answer

3600 seconds (1 hour)

Answer

43200 seconds (12 hours)

Answer

604800 seconds (7 days)

Question 4

A network engineer runs the following command to verify DHCPv6 pool configuration on router R1:

R1# show ipv6 dhcp pool

Output:
 Pool DHCPv6_POOL :
   Prefix number: 1
   Prefix: 2001:DB8:1::/48
       Preferred lifetime 604800, valid lifetime 2592000
       Expires at Mar 01 2025 12:00 PM (2592000 seconds)
   DNS server: 2001:DB8::1
   Domain name: example.com
   Active clients: 5

What does this output indicate?

Accepted Answer

The DHCPv6 pool has 5 active clients and provides prefix delegation, DNS, and domain name.. The show ipv6 dhcp pool command displays DHCPv6 pool configuration. This pool has a prefix 2001:DB8:1::/48 for delegation, DNS server, domain name, and 5 active clients. The prefix has preferred and valid lifetimes.

Answer

The DHCPv6 pool is used only for stateless address autoconfiguration (SLAAC).

Answer

The DHCPv6 pool has 5 clients with addresses from the prefix 2001:DB8:1::/48.

Answer

The DHCPv6 pool has a preferred lifetime of 2592000 seconds.

Question 5

A network engineer runs the following command to verify DHCPv4 server conflict detection on router R1:

R1# show ip dhcp conflict

Output:
 IP address       Detection method   Detection time        VRF
 192.168.1.50     Ping               Mar 01 2025 10:00 AM  default
 192.168.1.75     Gratuitous ARP     Mar 01 2025 11:00 AM  default

What does this output indicate?

Accepted Answer

The DHCP server has detected two IP address conflicts on the network.. The show ip dhcp conflict command displays IP addresses that were found to be already in use on the network. Two conflicts are shown: one detected by ping, another by gratuitous ARP. These addresses are removed from the pool and not assigned until cleared.

Answer

The DHCP server has successfully assigned IP addresses 192.168.1.50 and 192.168.1.75.

Answer

The DHCP server uses only ping to detect conflicts.

Answer

The DHCP server has cleared all conflicts from the database.

Question 6

Which DHCPv4 message type does a client send to request a specific IP address previously offered?

Accepted Answer

DHCPREQUEST. The DHCPREQUEST message is used by the client to accept an offer and request the offered IP address, as defined in RFC 2131.

Answer

DHCPDISCOVER

Answer

DHCPOFFER

Answer

DHCPACK

Question 7

What is the default DHCPv6 client DUID type on a Cisco IOS-XE router?

Accepted Answer

DUID-LL (Link-Layer). Cisco IOS-XE defaults to DUID-LL (Link-Layer) for DHCPv6 clients, which uses the MAC address of the interface, per RFC 8415.

Answer

DUID-LLT (Link-Layer plus Time)

Answer

DUID-EN (Enterprise Number)

Answer

DUID-UUID (Universally Unique Identifier)

Question 8

In DHCPv6, what is the purpose of the SOLICIT message?

Accepted Answer

To discover available DHCPv6 servers. The SOLICIT message is sent by a DHCPv6 client to locate DHCPv6 servers, similar to DHCPDISCOVER in DHCPv4, as per RFC 8415.

Answer

To request a renewal of an existing lease

Answer

To confirm a previously allocated prefix

Answer

To release an IP address

Question 9

Which DHCPv4 option is used by a client to request a specific IP address in the DHCPREQUEST message?

Accepted Answer

Option 50 (Requested IP Address). Option 50 (Requested IP Address) is used by the client in DHCPREQUEST to specify the desired IP address, per RFC 2132.

Answer

Option 12 (Host Name)

Answer

Option 54 (Server Identifier)

Answer

Option 51 (IP Address Lease Time)

Question 10

Which DHCPv6 message is used by a server to respond to a SOLICIT with available configuration parameters?

Accepted Answer

ADVERTISE. The ADVERTISE message is sent by the DHCPv6 server in response to a SOLICIT, offering configuration parameters, per RFC 8415.

Answer

REPLY

Answer

RECONFIGURE

Answer

INFORMATION-REQUEST