beginner
28-09-2003, 06:02 AM
Mình suy nghĩ câu hỏi này nhiều nhưng vẫn chưa hiểu gi` hết, ai rảnh rỗi vui lòng chỉ giúp.
Cuối chương hai của CCNA exam 640-607 certification guide có 1 scenario như sau:
Example 2-9 shows that the running-config command was executed on the Nova router.
Example 2-9 Configuration of Router Nova
hostname Nova
banner # This is the router in Nova Sibiersk; Dress warmly before entering! #
!
boot system tftp c2500-js-113.bin 134.141.88.3
boot system flash c2500-j-l.111-9.bin
boot system rom
!
enable password cisco
!
interface Serial0
ip address 134.141.12.2 255.255.255.0
!
interface Serial1
ip address 134.141.23.2 255.255.255.0
!
interface TokenRing0
ip address 134.141.2.2 255.255.255.0
!
router rip
network 134.141.0.0
!
line con 0
password cisco
login
line aux 0
line vty 0 4
password cisco
login
Câu hỏi là:
Examine the following command output in Example 2-10, taken immediately before the
user is going to type the reload command. What IOS do you expect will be loaded?
Example 2-10 show ip route Command Output for Nova
Nova#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
134.141.0.0/24 is subnetted, 6 subnets
C 134.141.2.0 is directly connected, TokenRing0
R 134.141.3.0 [120/1] via 134.141.23.3, 00:00:15, Serial1
R 134.141.1.0 [120/1] via 134.141.12.1, 00:00:20, Serial0
C 134.141.12.0 is directly connected, Serial0
R 134.141.13.0 [120/1] via 134.141.12.1, 00:00:20, Serial0
[120/1] via 134.141.23.3, 00:00:15, Serial1
C 134.141.23.0 is directly connected, Serial1
Câu trả lời là
The boot system flash command would be used. The TFTP boot presumably would fail because there is not currently a route to the subnet of which the TFTP server is a part. It is reasonable to assume that a route would not be learned 2 minutes later when the router had reloaded. So, the next boot system command (flash) would be used.
------------------------------------------------
Mình có một thắc mắc là làm sao để biết được là "TFTP boot sẽ không thực hiện được bởi vì không có kết nối đến subnet của TFTP server"
Cuối chương hai của CCNA exam 640-607 certification guide có 1 scenario như sau:
Example 2-9 shows that the running-config command was executed on the Nova router.
Example 2-9 Configuration of Router Nova
hostname Nova
banner # This is the router in Nova Sibiersk; Dress warmly before entering! #
!
boot system tftp c2500-js-113.bin 134.141.88.3
boot system flash c2500-j-l.111-9.bin
boot system rom
!
enable password cisco
!
interface Serial0
ip address 134.141.12.2 255.255.255.0
!
interface Serial1
ip address 134.141.23.2 255.255.255.0
!
interface TokenRing0
ip address 134.141.2.2 255.255.255.0
!
router rip
network 134.141.0.0
!
line con 0
password cisco
login
line aux 0
line vty 0 4
password cisco
login
Câu hỏi là:
Examine the following command output in Example 2-10, taken immediately before the
user is going to type the reload command. What IOS do you expect will be loaded?
Example 2-10 show ip route Command Output for Nova
Nova#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
134.141.0.0/24 is subnetted, 6 subnets
C 134.141.2.0 is directly connected, TokenRing0
R 134.141.3.0 [120/1] via 134.141.23.3, 00:00:15, Serial1
R 134.141.1.0 [120/1] via 134.141.12.1, 00:00:20, Serial0
C 134.141.12.0 is directly connected, Serial0
R 134.141.13.0 [120/1] via 134.141.12.1, 00:00:20, Serial0
[120/1] via 134.141.23.3, 00:00:15, Serial1
C 134.141.23.0 is directly connected, Serial1
Câu trả lời là
The boot system flash command would be used. The TFTP boot presumably would fail because there is not currently a route to the subnet of which the TFTP server is a part. It is reasonable to assume that a route would not be learned 2 minutes later when the router had reloaded. So, the next boot system command (flash) would be used.
------------------------------------------------
Mình có một thắc mắc là làm sao để biết được là "TFTP boot sẽ không thực hiện được bởi vì không có kết nối đến subnet của TFTP server"