MTU

Question 1

Front

Answer 1

Back

Question 2

The […] is the largest unit a device can send/receive on an interface.

Answer 2

Maximum Transmission Unit (MTU)

Question 3

The default Ethernet MTU is [size].

Answer 3

1500 bytes

Question 4

The default IP MTU is [size].

Answer 4

1500 bytes

Question 5

[…] frames are typically defined as up to ~9000 bytes.

Answer 5

Jumbo

Question 6

[…] frames are even larger than Jumbo frames.

Answer 6

Super Jumbo

Question 7

[…] frames are typically defined as up to ~1600 bytes.

Answer 7

Baby Giant

Question 8

Initiate an extended ping:<br></br>R1# […]

Answer 8

<b>ping</b>

Question 9

The […] specifies the maximum payload of frames sent/received by an Ethernet interface.

Answer 9

Ethernet MTU

Question 10

Is MTU checked at ingress?

Answer 10

Yes

Question 11

Is MTU checked at egress?

Answer 11

Yes

Question 12

Ethernet MTU is also called […]

Answer 12

Interface MTU

Question 13

The […] specifies the maximum size of an IP packet before it needs fragmentation.

Answer 13

IP MTU

Question 14

Configure the Ethernet MTU of an interface:<br></br>R1(config-if)# […]

Answer 14

<b>mtu </b><i>bytes</i>

Question 15

Ping, specifying the size of each packet:<br></br>R1# […]

Answer 15

<b>ping </b><i>ip-address </i><b>size </b><i>bytes</i>

Question 16

Ping, setting the DF-bit:<br></br>R1# […]

Answer 16

<b>ping </b><i>ip-address </i><b>df-bit</b>

Question 17

Packets received on an interface that are larger than the interface’s MTU are counted as […].

Answer 17

giants

Question 18

If the DF-bit is not set, packets larger than the IP MTU are […].

Answer 18

fragmented

Question 19

If the DF-bit is set, packets larger than the IP MTU are […].

Answer 19

dropped

Question 20

The IP MTU [can/cannot] be greater than the Ethernet MTU.

Answer 20

cannot

Question 21

The IP MTU [can/cannot] be lower than the Ethernet MTU.

Answer 21

can

Question 22

Configure the IP MTU:<br></br>R1(config-if)# […]

Answer 22

<b>ip mtu </b><i>bytes</i>

Question 23

Configure the IPv6 MTU:<br></br>R1(config-if)# […]

Answer 23

<b>ipv6 mtu</b><i> bytes</i>

Question 24

View the system MTU values:<br></br>SW1# […]

Answer 24

<b>show system mtu</b>

Question 25

Configure the System MTU for 10 Mbps/100 Mbps interfaces:
SW1(config)# [...]

Answer 25

system mtu bytes
*on devices with only 1Gig+ interfaces, this command applies to all interfaces

Question 26

Configure the System MTU for 1 Gbps+ interfaces:
SW1(config)# [...]

Answer 26

system mtu jumbo bytes

Question 27

Configure the System MTU for routed ports:
SW1(config)# [...]

Answer 27

system mtu routing bytes

Question 28

The default IP MTU of a GRE tunnel interface is [size].

Answer 28

1476 bytes

Question 29

The Tunnel Transport MTU is automatically calculated based on ...

Answer 29

the IP MTU of the physical interface

Question 30

What does PMTUD stand for?

Answer 30

Path MTU Discovery

Question 31

[...] allows a device to dynamically discover the lowest MTU value in the path to a destination.

Answer 31

PMTUD

Question 32

Hosts with PMTUD enabled set the [...] on outgoing IP packets.

Answer 32

DF-Bit

Question 33

Can the tunnel interface's IP MTU be higher than the Tunnel Transport MTU?

Answer 33

Yes
*Packets larger than the Tunnel Transport MTU will be fragmented