0
votes
1answer
52 views

If you have a T3 dedicated line do you need a VPN?

Is this redundant or can you run VPN on a T3 dedicated line? Do you still need security protection on the T3 line? I was going to put VPN on my T3 line in my project, but after reading it through it ...
0
votes
0answers
35 views

Fragmentation of packets in virtual circuits

Is it possible for packets passing through a virtual circuit to become fragmented? If so, how and why?
2
votes
1answer
551 views

How many subnets are needed?

I'm just starting out with networks. I'm trying to determine how many subnets are needed for this network: BRANCH1, BRANCH2 and HQ are routers. The Boxes between routers and PCs are switches. The ...
0
votes
2answers
502 views

What is the difference between link speed and propagation speed of a network link?

In one assignment, the direct link transmission rate is given as 20 Mbps and the propagation speed over the link is 25x 10^7 meter/sec. This link connects host A to B. How is there a difference ...
1
vote
2answers
80 views

How clocks get synchronized? [closed]

In a syschronus communication between two DTEs, the frames sent are composed of an initial burst of bits (0s and 1s) to force the reciever DTE to synchronize its clock. Is it possible that the ...
1
vote
1answer
135 views

Token Ring - is a MAU required?

I'm writing a paper for school on Token Ring, but I'm having trouble discerning something. From what I understand, there are two types of Token Ring networks: wired, and star-wired. I understand ...
1
vote
1answer
143 views

Subnetting - how to?

I can't cope with this MS 70-291 Training Kit Task: What is the configuration error in the diagram below and WHY? (btw: I have removed original, wrong mask which was editors error and placed big red ...
3
votes
1answer
142 views

Configuring subnets quandry

I am learning the basics of subnetting however am faced with a dilemma on approaching the issue. For example I have been tasked to set up a network with 20 hosts using a Class C network addressing ...
1
vote
1answer
1k views

Can I temporarily affect ARP table without using `arp` command directly?

I have some knowledge about arp command under linux which can help modify the ARP table. Now I want to temporarily affect ARP table(add, delete and change) entries without the help of arp. For ...
0
votes
2answers
777 views

subnet mask creater

Create a sub net mask for 512 subnets using 172.31.0.0 The default sub net mask for a class b network is 255.255.0.0, working through the borrowing off bits using the formula 2^n, n being the bits ...
0
votes
1answer
379 views

Mask a class D IP address

Last time I asked about masking class D ip addresses. I found that we cannot mask class D IP addresses. But, now I have another question about masking D class IP addresses: If I want to recieve a ...
2
votes
3answers
3k views

Class D ip address

Is there mask for class D ip address? As it is for multicast, I am not sure about it. I read somewhere that D ip addressas are 32-bit network addresses and they dont have hostID, but in the following ...
0
votes
1answer
2k views

How do I calculate how long a packet will reach its destination?

I am stuck with this homework question. I honestly have no clue what it is talking about. The question asked: You are transmitting 100 bit packets over a long distance link of 40 km. I assume ...
0
votes
1answer
898 views

Why is byte stuffing preferred to use with PPP?

I read that PPP can use both bit and byte stuffing, but I can't think of any reason why byte stuffing is preffered. Can you?
1
vote
1answer
683 views

What is the purpose of the network id?

I know that for addresses like e.g. 192.168.17.5 with 255.255.255.0 subnet mask, address 192.168.17.0 is the network id and 192.168.17.255 is the broadcast address and that valid hosts are from ...
2
votes
5answers
7k views

Can you have a class C IP address with a subnet mask of 255.255.0.0?

Can you have a class C IP address with a subnet mask of 255.255.0.0? What happens when you have a setting like this?
1
vote
1answer
534 views

retransmission of lost TCP segment

What will happen in the following scenario (assume the connection is already established): (stack A) send 10 byte data (stack B) send ACK for 10 byte data (stack B) send 200 byte data (stack B) send ...