Exam 200-301 topic 1 question 582 discussion

B and C configure fa0/0, so those are incorrect. Bootps uses UDP so A is also incorrect. D is correct, but the answer has a flaw: As they use a non rearrangeable ACL the ACE would be added at the bottom, below the deny rule (rendering the newly added rule useless).

it´s D simply.. fe0/1 + UDP

Selected Answer: D The correct configuration that enables DHCP addressing for hosts connected to interface FastEthernet0/1 on router R4 is option D. The configuration is as follows: CLI: interface FastEthernet0/1 ip helper-address 10.0.1.1 ! access-list 100 permit udp host 10.0.1.1 eq bootps host 10.148.2.1 Option D is the only configuration that specifies the correct protocol (udp) and port number (bootps) for DHCP1. Option A specifies the wrong protocol (tcp) and port number (67), while option B specifies the correct protocol but the wrong port number (bootps instead of 67). Option C specifies neither the correct protocol nor the correct port number.

Consider UDP port 67/68 for DHCP ; A seems best

all answers are wrong , the protocol is written at the end not before the destination so it should be c abut C is also missing the transport protocol before the source , access-list 100 udp source destination eq 65

dhcp is udp and iphelper in f0/1 interface LAN

As port 67 and bootps is kind of similar in the sense that it doesn't really give you a huge differentiating factor notice the transport protocols. Bootps and DHCP both are listed as UDP 67.

why only permit specific host instead of network ? the question is asking the config to allow source hosts of the subnet.

Answer D First = need to be configured On Fa 0/1 as the host is this Interface per the Question requirement Second =DHCP uses UDP port 67 https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol#:~:text=The%20DHCP%20employs%20a%20connectionless,is%20used%20by%20the%20client.

*I mean DHCP uses UDP port 67 https://www.sysnettechsolutions.com/en/what-is-bootp/

DHCP uses TCP port 67 https://www.sysnettechsolutions.com/en/what-is-bootp/

answer: D; BOOTP is implemented using the User Datagram Protocol (UDP) for transport protocol, port number 67 is used by the (DHCP) server for receiving client-requests and port number 68 is used by the client for receiving (DHCP) server responses. BOOTP operates only on IPv4 networks.

A is correct. Can assign TCP to port 67 (DHCP)

"for hosts connected to interface FastEthernet0/1" not B &C DHCP is UDP port 67 D is correct

LAN is Fa 0/1 and DHCP is UDP so it's D

ip helper-address must be configured on FastEthernet0/1 right? because it is the interface closest to the clients. So B and C are already eliminated from the choices. And DHCP uses UDP so D is the answer i think. Pls correct me if im wrong

TCP 67 is bootp but DHCP is UDP bootp. Is TCP or UDP used for DHCP? The DHCP employs a connectionless service model, using the User Datagram Protocol (UDP). It is implemented with two UDP port numbers for its operations which are the same as for the bootstrap protocol (BOOTP). B is correct.