B.

security group tag number assigned to each port on a network

Explanation: Cisco TrustSec uses tags to represent logical group privilege. This tag, called a Security Group Tag (SGT), is used in access policies. The SGT is understood and is used to enforce traffic by Cisco switches, routers and firewalls . Cisco TrustSec is defined in three phases: classification, propagation and enforcement.

When users and devices connect to a network, the network assigns a specific security group. This process is called classification. Classification can be based on the results of the authentication or by associating the SGT with an IP, VLAN, or port-profile (-> Answer 'security group tag ACL assigned to each port on a switch' and answer 'security group tag number assigned to each user on a switch' are not correct as they say “assigned … on a switch” only. Answer 'security group tag ACL assigned to each router on a network' is not correct either as it says “assigned to each router”).

A.

vBond

D.

EIGRP uses the DUAL distance vector algorithm, and OSPF uses the Dijkstra link-state algorithm

Explanation: EIGRP is based on DUAL (Diffusing Update Algorithm) while OSPF uses Dijkstra's Shortest Path Algorithm with the major difference in how they calculate the shortest routing path.

OSPF has capability to calculate the best shortest path to each reachable subnet/network using an algorithm called SFP (Shortest Path First) also known as Dijkstra algorithm. “Neighbor Table” that contain all discovered OSPF neighbour with whom routing information will be interchanged.

B.

The router with the lowest IP address

C.

Increase the NAT pool size to support 254 usable addresses

D.

spanning-tree mst 1 priority 4096

E.

spanning-tree mst vlan 10.20 priority root

A.

192.168.101.18

Explanation: The ‘>’ shown in the output above indicates that the path with a next hop of 192.168.101.2 is the current best path.

Path Selection Attributes: Weight > Local Preference > Originate > AS Path > Origin > MED > External > IGP Cost > eBGP Peering > Router ID BGP prefers the path with highest weight but the weights here are all 0 (which indicate all routes that are not originated by the local router) so we need to check the Local Preference.

Answer
'192.168.101.18' path without LOCAL_PREF (LocPrf column) means it has the default value of 100.
Therefore we can find the two next best paths with the next hop of 192.168.101.18 and 192.168.101.10.

We have to move to the next path selection attribute: Originate. BGP prefers the path that the local router originated (which is indicated with the “next hop 0.0.0.0”). But none of the two best paths is self-originated.

The AS Path of the next hop 192.168.101.18 is shorter than the AS Path of the next hop 192.168.101.10 then the next hop 192.168.101.18 will be chosen as the next best path.