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 CCNA interview questions  CCNA Interview Questions
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Question
hi shain/sudeep and rest of all plz answer these question 
for help some one as soon as possible 

what is stub area
what is transit area
let there are three area in ospf a0 a2 and a3 if a2 and a3 
is coneted
through each other will they comnicate
 Question Submitted By :: Jitu
I also faced this Question!!     Rank Answer Posted By  
 
  Re: hi shain/sudeep and rest of all plz answer these question for help some one as soon as possible what is stub area what is transit area let there are three area in ospf a0 a2 and a3 if a2 and a3 is coneted through each other will they comnicate
Answer
# 1
Stub Area: Stub area is defined as area which can accept
intra-area routes (LSA 1 & LSA 2), Inter-area routes (LSA 3
& LSA 4) but don't accept any external routes (LSA 5) that
is redistributed in OSPF area. A backbone area will
advertise a default routes to a stub area or a network
summary LSA for the destination 0.0.0.0

Stub area limitation are - 
a. Stub area can't include virtual links
b. Stub area can't include an ASBR.
c. Stubbiness must be configured on all routers in the area.

     R1------R2-----R3
     !       !      !
     !       !      !
     !       !      !
    NW1     NW2    NW3

R1
Interface IP Address Subnet Mask

S1/0  - 1.1.1.1 255.0.0.0
Fa 0/0 - 10.1.1.1 255.0.0.0

R2
Interface IP Address Subnet Mask

S 1/0 - 1.1.1.2 255.0.0.0
S1/1 -  2.2.2.1 255.0.0.0
Fa0/0 20.1.1.1 255.0.0.0

R3
Interface IP Address Subnet Mask

S1/0 - 2.2.2.2 255.0.0.0
Fa0/0 -  30.1.1.1 255.0.0.0


R1 configuration - 

Router ospf 1
Network 1.1.1.1 0.0.0.0 area 0
Network 10.0.0.0 0.255.255.255 area 1

R2 Configuration - 

Router ospf 1
Network 1.1.1.2 0.0.0.0 area0
Network 2.2.2.1 0.0.0.0 area2

Router eigrp100
Network 20.0.0.0
No auto-summary
Router ospf 1
Redistribute eigrp 100 metric 10 subnets

R3 Configuration - 

Router ospf 1
Network 2.2.2.2 0.0.0.0 area2
Network 30.0.0.0 0.255.255.255 area2

Varification on Router3 

R3#show ip route
O IA 1.0.0.0/8 [110/128] via 2.2.2.1, 00:01:08, Serial0
C 2.0.0.0/8 is directly connected, Serial0
O E2 20.0.0.0/8 [110/10] via 2.2.2.1, 00:00:03, Serial0
O IA 10.0.0.0/8 [110/129] via 2.2.2.1, 00:01:08, Serial0
C 30.0.0.0/8 is directly connected, Ethernet0
The output displays inter-area routes (O IA) and OSPF
external type 2 (O E2).

Now, Configure OSPF Area 1 as Stub.

R2
Router ospf 1
Area 1 stub

R3
Router ospf 1
Area 1 stub

After configuring stub, verify the routing table on R3.

R3#show ip route
O IA 1.0.0.0/8 [110/128] via 2.2.2.1, 00:00:03, Serial0
C 2.0.0.0/8 is directly connected, Serial0
O IA 10.0.0.0/8 [110/129] via 2.2.2.1, 00:00:03, Serial0
C 30.0.0.0/8 is directly connected, Ethernet0
O*IA 0.0.0.0/0 [110/65] via 2.2.2.1, 00:00:03, Serial0

The output displays default route and inter-area routes,
both designated with (OIA) in the
routing table.
Default route is denoted as (O* IA).
 
Is This Answer Correct ?    0 Yes 0 No
Shahin
 
  Re: hi shain/sudeep and rest of all plz answer these question for help some one as soon as possible what is stub area what is transit area let there are three area in ospf a0 a2 and a3 if a2 and a3 is coneted through each other will they comnicate
Answer
# 2
Transit area: Transit area are used to pass traffic from an
area that is not directly connected to backbone area.
Transit area doesn't originate that traffic and is not the
destination for those traffic.

By definition we can say that OSPF area 0 is a transit area.
 
Is This Answer Correct ?    0 Yes 0 No
Shahin
 
 
 
  Re: hi shain/sudeep and rest of all plz answer these question for help some one as soon as possible what is stub area what is transit area let there are three area in ospf a0 a2 and a3 if a2 and a3 is coneted through each other will they comnicate
Answer
# 3
yes, if a2 & a3 are connect to each other through virtual link. thn dey cn comm. wid ech other.......
 
Is This Answer Correct ?    0 Yes 0 No
Shivali
 

 
 
 
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