A.point-to-point connections between two switches allowing concurrent transmit and receive

B.a pair of fiber optic strands allowing transmit on one and receive on the other at the same time

C.CB radio using push-to-talk

D.a mobile phone call

A.Core-2(config)# ip route 0.0.0.0/0 10.1.1.1 vrf GREEN Host-B: assign the default-gateway address 10.1.20.181

B.Core-1(config)# ip route 10.1.20.0/24 10.1.1.2 vrf GREEN Host-B: assign the default-gateway address 10.1.20.1

C.Core-1(config)# ip route 10.1.20.0/24 10.1.1.2 vrf GREEN Host-B: assign the default-gateway address 10.1.20.181

D.Host-B: assign the default-gateway address 10.1.20.181

A.security issues with a redundant loop indicating to hackers that a back-door exists

B.multiple frame copies leading to instability of the MAC address table

C.costs associated with upgrading from copper to fiber

D.broadcast storms

E.routing loops