排错HSRP的CSAE题，第4问有哪位大神帮我解释一下，万分感谢
HSRP这道CASE题第4小问选哪个啊，我看之前的视频是选B，最新的题库选的是C，R4和R5为啥会有DHCP的问题，有点不明白，有大神讲解一下吗QUESTION 4
Examine the configuration on R5. Router R5 do not see any route entries learned from R4; what could be
the issue?
A. HSRP issue between R5 and R4
B. There is an OSPF issue between R5and R4
C. There is a DHCP issue between R5 and R4
D. The distribute-list configured on R5 is blocking route entries
E. The ACL configured on R5 is blocking traffic for the subnets advertised from R4.
Correct Answer: C
Section: (none)
Explanation
Explanation/Reference:
R5 configuration :-
int gig0/0
ip address dhcp
This interface not getting dhcp ip address from R4. So even though OSPF configuration was like 0.0.0.0
0.0.0.0 area 0 , because this interface does not get correct ip address from DHCP it can’t participate in
OSPF.
R4 configuration :-
ip dhcp exlude address
ip dhcp pool ine
network x.x.x.x x.x.x.x
i think default router command was missing here . not sure
but
Int gig0/0
ip address dhcp .
This interface on R4 should have ip address configured on it instead of ” ip address dhcp ” . Hence its not
able to provide dhcp lease address to R5.
R4 also had ospf configured as network 0.0.0.0 0.0.0.0 area 0. So all interface can participate if they are
up and if they have ip address.
But because R5 interface connected to R4 could not obtail correct dhcp ip address from R4 due to DHCP
issue they wont form ospf neighborship.
So correct answer is DHCP issue between R5 & R4.
Looks like R5 Gig0/0 (I presume 192.168.2.0/24 network interface?) is getting an IP address from the R4 router.
And as you can see from the description, R4 should hand out an IP address for R5 but it doesn't due to wrong DHCP pool configuration.
Also OSPF network statements looks OK to me. "net 0.0.0.0 0.0.0.0 a 0" is totally acceptable. So the main culprit to the route failure is the DHCP not the OSPF config.
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