Các anh chỉ giúp em mấy câu hỏi này

[tuaninbox]

Các anh cho em hỏi mấy câu sau đây:

Question 1:
What are two advantages for using subinterfaces in an NBMA topology? (Choose two)
A. IP addressing space is conserved.
B. Routing protocols avoid split-horizon issues.
C. Logical interfaces are more reliable than physical interfaces.
D. When a subinterfaces state changes to down, the physical interface remains up.

Question 2:
What are two possible problems that can occur when a large number of routers operate in a single OSPF
area? (Choose two)
A. Excess LSA traffic.
B. More reachability errors.
C. Frequent routing table recalculation.
D. Frequent adjacencies table recalculation.

Question 3:
By default, which information does an OSPF summary line Type 3 entry includes?
A. Network addresses for an area that are summarized at their classful boundary
B. Summarized entries for network addresses in an area
C. Network addresses for all networks in an area
D. Network addresses for all networks in the OSPF autonomous system

Em cám ơn.

[Encrytion]

these are my choosing!

1.B,D
2.A,C
3.B

Please correct me if I'm wrong. :lol:

cheers!

[tuaninbox]

Anh Encrytion có thể giải thích tại sao anh chọn như vậy không?

Cám ơn

[sinhvienngheo]

Các anh cho em hỏi mấy câu sau đây:

Question 1:
What are two advantages for using subinterfaces in an NBMA topology? (Choose two)
A. IP addressing space is conserved.
B. Routing protocols avoid split-horizon issues.
C. Logical interfaces are more reliable than physical interfaces.
D. When a subinterfaces state changes to down, the physical interface remains up.

Question 2:
What are two possible problems that can occur when a large number of routers operate in a single OSPF
area? (Choose two)
A. Excess LSA traffic.
B. More reachability errors.
C. Frequent routing table recalculation.
D. Frequent adjacencies table recalculation.

Question 3:
By default, which information does an OSPF summary line Type 3 entry includes?
A. Network addresses for an area that are summarized at their classful boundary
B. Summarized entries for network addresses in an area
C. Network addresses for all networks in an area
D. Network addresses for all networks in the OSPF autonomous system

Em cám ơn.

Đây là đáp án của em.

1. B,D
Giải thích: Không thể chọn A do các sub-interfaces làm tốn nhiều net.
Không thể chọn C do các logical interfaces vẫn dựa trên physical interface trong trường hợp này.
2. A,C
Giải thích:

Khi có nhiều ospf routers, các lsa sẽ được tạo ra nhiều. bảng routing cũng bị tính toán lại.
3. B:

Giải thích: Lệnh area range sẽ summary một số network address trong area.

chúc anh thành công,