Question 1 How long is the typical default keepalive timer for TCP? 1. 10 millis

Question

Question 1

How long is the typical default keepalive timer for TCP?

1.

10 milliseconds

2.

1 second

3.

5 minutes

4.

2 hours

Question 2

What is the primary reason that large packets may not be more efficient in routing IP networks?

1.

The additional processing time associated with the cut-through nature of the IP router

2.

The additional overhead associated with a larger bandwidth connection

3.

The additional latency due to the store-and-forward nature of the IP router

4.

The TCP connection overhead required from hop-to-hop

Question 3

What additional parameter is typically used to protect against wrapped sequence numbers on high-bandwidth connections?

1.

DF

2.

keepalive

3.

timestamp

4.

TTL

Question 4

What does OID stand for?

1.

Object IDentifier

2.

Organized Identifying Data

3.

Object Instance Data

4.

Ordered Information Director

Question 5

What is the typical port for an SNMP agent to use for managers to connect to?

1.

1812

2.

22

3.

80

4.

161

Question 6

Which of the following are notifications generated by the snmp agent on a router, rather than information requested by an snmp manager?

1.

get-next

2.

trap

3.

get

4.

get-bulk

1.

10 milliseconds

2.

1 second

3.

5 minutes

4.

2 hours

Explanation / Answer

Here are the answers for your questions

1.
Correct option-4 (2 hrs)

Keepalive time is the duration between two keepalive transmissions in idle condition
for Windows PCs,default keepalive timer for TCP is 7200000ms (2 hour)

2.
Correct option-2

Large packets are not more efficient in routing IP networks because the larger the packets are, and ethernet allows for sending variable length frames, the fewer of them it takes to fill the pipe.
The fewer frames, the fewer gaps, the fewer preambles, and, thus, the less overhead that is incurred.

3.
Correct option-3(timestamp)

Using TCP timestamps provides protection against wrapped sequence numbers (PAWS). The TCP sequence number is a 32-bit value that indicates the first byte of data in the segment. With 32 bits in the sequence number, only 4 GB of data can be in transit between the sender and the receiver before the TCP sequence number begins to wrap around and become ambiguous. While this is not likely in typical Ethernet and Token Ring environments,
high capacity networks using Gigabit per second (Gbps) or Terabit per second (Tbps) technologies can wrap the TCP sequence number in a matter of seconds.If a segment is dropped or delayed, a different segment could exist with the same sequence number. Corrupted data could result from the receiver misinterpreting the new sequence number with an old sequence number it is expecting to receive.To avoid confusion in the event of duplicate sequence numbers, the TCP timestamp is used as an extension to the sequence number.

4.
Correct option-1(Object IDentifier)

In computer programming, an object identifier generally takes the form of an implementation-specific integer or pointer that uniquely identifies an object.
However, OIDs are a specific approach to creating globally unique object identifiers in a distributed system.

5.
Correct option-4(161)
SNMP uses the simple UDP transport service and UDP port 161 is used by SNMP agent to connect with managers.

6.
Correct option -2(trap)
here are the descriptions:-

Get, GetBulk, and GetNext requests

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