Answer:
Matlab code is:
>> 
>> 
>> 
>> 
>> 
>>
>> ![Vc=[M(2,:) M(:,3)']](https://tex.z-dn.net/?f=Vc%3D%5BM%282%2C%3A%29%20M%28%3A%2C3%29%27%5D)
Explanation:
>>
>> 

1 7 13 19 25
3 9 15 21 27
5 11 17 23 29
>> 
>>
>> 

>> 
>>
>> 

>>
>>
>> ![Vc=[M(2,:) M(:,3)']](https://tex.z-dn.net/?f=Vc%3D%5BM%282%2C%3A%29%20M%28%3A%2C3%29%27%5D)

>>
The code is tested and is correct. If you put a semi colon ' ; ' at the end of every statement then your answer will be calculated but matlab doesn't show it until you ask i.e. typing the variable (Va, Vb, Vc )and press enter.
Answer:
QoS
Explanation:
We could use a blacklisting or a MAC filtering to remove from the network, and in this way, we're going to get a high portion of bandwidth, but other must work too, and the whitelisting have almost the same function, but QoS Quality of service is specifically for these cases where we need high bandwidth for a video conference, we can make this with some tools or techniques like jitter buffer and traffic shaping.