Refer to the exhibit.
Which two statements are true? (Choose two)
A.
DHCPDISCOVER packets will reach the DHCP server.
B.
The router will not forward DHCPDISCOVER packets because it has not been configured
to do so.
C.
This configuration is applied to interface Fa0/1.
D.
DHCPDISCOVER packets will not reach the DHCP server because DHCPDISCOVER
packets are broadcasts.
E.
DHCPDISCOVER packets will not reach the DHCP server because ports 67 and 68 have
not been explicitly allowed by the ip forward-protocol command.
F.
This configuration is applied to interface Fa0/0.
Explanation:
While routers accept and generate broadcasts, they do not forward them. This can be quite
a problem when a broadcast needs to get to a device such as a DHCP or TFTP server that’s
on one side of a router with other subnets on the other side.If this PC attempts to locate a DNS server with a broadcast, the broadcast will be stopped by
the router and will never get to the DNS server. By configuring the ip helper-address
command on the router, UDP broadcasts such as this will be translated into a unicast by the
router, making the communication possible. The command should be configured on the
interface that will be receiving the broadcasts.
R1(config)#int e0
R1(config-if)#ip helper-address ?
A.B.C.D IP destination address
R1(config-if)#ip helper-address 10.1.1.1
This command does forward eight common UDP service broadcasts by default.
• TIME, port 37
• TACACS, port 49
• DNS, port 53
• BOOTP/DHCP Server, port 67
• BOOTP/DHCP Client, port 68
• TFTP, port 69
• NetBIOS name service, port 137
• NetBIOS datagram service, port 138
That’s going to cover most scenarios where the ip helper-address command will be useful,
but what about those situations where the broadcast you need forwarded is not on this list?
You can use the ip forward-protocol command to add any UDP port number to the list. In
this particular case, ports 67 and 68 were not included, so the BOOTP packets will not be
sent to the DHCP server.
A & E can’t BOTH be correct.
This is completly wrong. D and F are correct. DHCP discovers are bcast packets so they stop at the router. The router relay the packet as unicast to the dhcp server.
helper udp 67 and 68 are enabled by default enable.
This should be enable to the client facing interface.
(2/Nov/2017 Updated) New 300-101 Exam Questions:
NEW QUESTION 459
Frame Relay LMI autosense. Which statements are true? (Choose two.)
A. Line should be up and protocol should be down.
B. Protocol must be up.
C. It only works on DTEs.
D. It only works on DCEs.
Answer: AC
NEW QUESTION 460
Which two protocols can cause TCP starvation? (Choose two.)
A. TFTP
B. SNMP
C. SMTP
D. HTTPS
E. FTP
Answer: AB
NEW QUESTION 461
Which two protocols can cause TCP starvation? (Choose two.)
A. TFTP
B. SNMP
C. SMTP
D. HTTPS
E. FTP
Answer: AB
NEW QUESTION 462
Which two options are limitations of Stateful NAT64? (Choose two.)
A. it is unable to route VRF traffic
B. it is unable to route multicast traffic
C. it supports FTP traffic only with an ALG
D. it supports DNS64 only
E. layer 4 supports TCP only
Answer: AB
NEW QUESTION 463
Refer to the exhibit. How can you configure a second export destination for IP address 192.168.10.1?
configure terminal
ip flow-export destination 192.168.10.1 9991
ip flow-export version 9
A. specify a different TCP port
B. specify a different UDP port
C. specify a VRF
D. configure a version 5 flow-export to the same destination
E. specify a different flow ID
Answer: C
NEW QUESTION 464
Which value does Frame Relay use to identify a connection between a DTE and DCE?
A. DLCI
B. IP address
C. MAC address
D. VLAN ID
Answer: A
NEW QUESTION 465
If you want to migrate an IS-IS network to another routing protocol with ……? (Choose two.)
A. UDP
B. Internal BGP
C. TCP/IP
D. EIGRP
E. OSPF
F. RIP
Answer: DE
NEW QUESTION 466
IP CEF load-sharing options ……? (Choose three.)
A. Tunnel
B. Universal
C. Include-ports
D. Source
E. Destination
Answer: ABC
NEW QUESTION 467
What is the minimum privilege level to enter all commands in usermode?
A. Level14
B. Level0
C. Level1
D. Level15
Answer: C
NEW QUESTION 468
Which two statements about password-protecting device access are true? (Choose two)
A. The more system:running-config command displays encrypted passwords in clear text.
B. The service password-encryption command forces a remote device to encrypt the password.
C. A network administrator can recover an encrypted password.
D. The privilege level command controls the commands a specific user can execute.
E. The password can be encrypted in the running configuration.
Answer: DE
NEW QUESTION 469
……
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