Which of the following factors determines the OSPF router ID when configuring a router with both physical and logical interfaces?
A. The lowest network number of any interface.
B. The highest network number of any interface.
C. The highest IP address of any logical interface.
D. The middle IP address of any logical interface.
E. The lowest IP address of any physical interface.
F. The highest IP address of any physical interface.
G. The lowest IP address of any logical interface.
Select the 1 best answer
當(dāng)使用物理及邏輯接口配置路由器時,上述哪一個決定OSPF路由器ID?
解答:
OSPF拓?fù)鋽?shù)據(jù)庫包含路由器和子網(wǎng)或鏈路以及附加在它們上面的信息,在鄰居列表數(shù)據(jù)庫中識別路由器,OSPF在每個路由器上使用路由器ID(RID)。
當(dāng)OSPF啟動運(yùn)行時,在物理接口上的路由器的OSPF RID為IP地址。
注意:OSPF路由器ID是一個在OSPF處理起始時選擇的32位的IP 地址。在路由器上配置的IP地址即為路由器ID。如果配置了一個環(huán)回地址,那它就是這個路由器的ID,在多環(huán)回地址的示例中,的環(huán)回地址就是這個路由器的ID,被選中的路由器ID是不可更改的,除非移除該IP地址或重新啟動OSPF。
正確答案:F
參考:
CCNA Self-Study CCNA ICND exam certification Guide(Ciscopress,ISBN 1-58720-083-x)Page 208