Verify OSPF configuration $(4$ marks$)$

A$)$ Display the routing table on router R$5.$ Include a screenshot of the routing table $($use the show ip route ospf command to display the routing table$)$

Note: you should be able to see $5$ networks advertised by OSPF $(170\mathrm{.}125\mathrm{.}1\mathrm{.}0/24,170\mathrm{.}125\mathrm{.}3\mathrm{.}0/24,10\mathrm{.}0.\frac{125\mathrm{.}8}{30},10\mathrm{.}0.\frac{125\mathrm{.}24}{30},$ and $192\mathrm{.}168.\frac{125\mathrm{.}0}{24}).$ If you do not see these $5$ networks, then something went wrong when you advertised the networks via OSPF; try to fix this problem. B$)$ Testing the connectivity between the different networks, include a screenshot of the ping results.

From PC$3$ ping PC$4$

From PC$3$ ping PC$1$

$0$ From PC$4$ ping PC$1$

From PC$4$ ping PC$2$

Note: the ping should be successful for all the cases.

Configure a standard ACL on R$4(10$ marks$)$

For each step include a screenshot$($s$)$ covering all its tasks.

Step $1.$ Configure the standard ACL on R$4(6$ marks$)$

The ACL should perform the following issues:

Allow only PC$4(170.$XXX$\mathrm{.}1\mathrm{.}10)$ from network $170\mathrm{.}125\mathrm{.}1\mathrm{.}0/24$ to access network $192\mathrm{.}168\mathrm{.}125\mathrm{.}0/24.$

Allow all the devices one network $170\mathrm{.}125\mathrm{.}3\mathrm{.}0/24$ except PC$3(170.$XXX$\mathrm{.}3\mathrm{.}10)$ to access network $192\mathrm{.}168\mathrm{.}125\mathrm{.}0/24.$

Permit all other traffic to network $192\mathrm{.}168\mathrm{.}125\mathrm{.}0/24.$

Note: the access list number should be $xx($with $xx$ are the last $2$ digits of your university ID; if $xx=00$ then consider $xx=55)$

Step $2.$ Apply the ACL $(2$ mark$)$

Apply the ACL to Router R$4$ interface G$0/0$ for traffic exiting the interface $|$

Step $3.$ Test the ACL $(2$ marks$)$

From PC$4$ ping PC$1.$

Change the IP of PC$4$ to $170\mathrm{.}125\mathrm{.}1\mathrm{.}15$ and ping PC$1$

From PC$3$ ping PC$2$

Change the IP of PC$3$ to $170\mathrm{.}125\mathrm{.}3.15$ and ping PC$2$

Note: only the ping of parts a and $d$ should be successful

Save the running configuration to the start$-$up configuration on Routers and Switches.