Refer to the exhibit. A network engineer configures a GRE tunnel and enters the show interface tunnel command. What does the output confirm about the configuration?
A.
The keepalive value is modified from the default value.
cisco(config-if)#do s runn int tun111
Building configuration...
Current configuration : 116 bytes
!
interface Tunnel111
ip address 1.1.1.1 255.255.255.252
tunnel source Loopback0
tunnel destination 2.2.2.2
end
cisco(config-if)#
cisco(config-if)#do s int tun111 | i trans
Tunnel protocol/transport GRE/IP
...
#show show running-config all | begin Tunnel100
interface Tunnel100
tunnel mode gre ip (default)
tunnel ttl 255
tunnel bandwidth transmit 8000
tunnel bandwidth receive 8000
keepalive 10 3 (default)
tunnel source GigaEthernet0/1 (config)
tunnel destination 209.165.202.130 (config)
Nota: Para implementar un tracking, es necesario usar el comando track junto con herramientas como IP SLA para monitorear rutas, estados o accesibilidad específicos.
Option A is incorrect, the Default value has not been modified "The default values are 10 seconds for the interval and 3 retries."
Option B is incorrect, the physical interface MTU = 1476 + 15 = 1500 bytes
Option C is also incorrect, the default tunnel mode is none. To use GRE/IP mode, you have to explicitly set the mode to "tunnel mode gre ipv4" or "tunnel mode gre ipv6".
Option D is correct, the source interface Gig 0/1 status is being tracked and monitored to determine the state of the GRE tunnel.
keepalives on GRE tunnels: "The default values are 10 seconds for the interval and 3 retries."
https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/118370-technote-gre-00.html
Apologies, I misread option A. Option A is also incorrect; the keepalive value has not been modified from the default value. This makes option D the only valid choice, as the status and health of the tunnel are being determined by tracking (monitoring) the state of the source interface GigabitEthernet0/1.
Tunnel Mode has nothing to do with Keepalive settings. We are talking about the tunnel mode settings. C is still correct, but keepalives can be adjusted, and it still could be using the default tunnel mode.
switch(config)#tunnelmode{greip | ipip{ip|decapsulate-any}}
C
If you are running a Cisco IOS image prior to Cisco IOS Release 12.2(13)T, the default retry value is 3.
The default value for the retries argument was increased to 5 after IOS version 12.2(13)T released
Reference:
https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/sb_gretk.html#:~:text=If%20you%20are%20running%20a%20Cisco%20IOS%20image%20prior%20to%20Cisco%20IOS%20Release%2012.2(13)T%2C%20the%20default%20retry%20value%20is%203.
Not A : configure keepalive without define value, it default is 10.
Not B : Its refer to PHYSICAL interface MTU, what output shown is the MTU of the Tunnel transport MTU
Not D : It seem to be tracking , but not. The output "source tracking" may lead us to believe it is.
Actually when define the tunnel source use phyiscal interface, this tunnel source output shown.
C is correct answer : No tunnel mode define it default is GRE/IP.
Correct answer is C
Not A : configure keepalive without define value, it default is 10.
Not B : Its refer to PHYSICAL interface MTU, what output shown is the MTU of the Tunnel transport MTU
Not D : It seem to be tracking , but not. The output "source tracking" may lead us to believe it is.
Actually when define the tunnel source use phyiscal interface, this tunnel source output shown.
C is correct answer : No tunnel mode define it default is GRE/IP.
Please refer to actual configuration and show interface tunnel out on router.
interface Tunnel200
no ip address
keepalive 10 3
tunnel source Ethernet0/0
tunnel destination 2.2.2.2
Switch-1(config-if)#keepalive ?
<0-32767> Keepalive period (default 10 seconds)
<cr>
A - yes the time was modified which is why its showing keepalive set but it still has its default value.
C - when you create the tunnel if you dont specify a tunnel mode it defaults to gre.
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