CCNA question 2

Can anyone help to answer the following questions?
1. Which of the follow types of crosstalk?
A. near-end crosstalk
B. jitter crosstalk
C. far end crosstalk
D. middle closed-end crosstalk
E. power sum near-end crosstalk

2. Which of the following are VLAN frame encapsulation types that may be configured on a catalyst switch?(Choose 2)
A. VTP
B. ISL
C. CDP
D. 802.1Q
E. LLC

3. Which one describe global command?
A. A command that is available in every release of IOS, regardless of the version or deployment status.
B. A command that is set once and affects the entire router.
C. A command that can be entered in any configuration mode.

4. On which types of network will OSPF elect a backup designated router?
A. Point-to-point and multiaccess
B. Point-to-multipoint and multiaccess
C. Point-to-point and Point-to-multipoint
D. Nonbroadcast and broadcast multipoint
E. Nonbroadcast and broadcast multiaccess

Q2. B & D are both trunking protocols.

Q3. C

I'm not sure about 1 and 4.

1. A,C,E
4. E

I would pick those.

Thanks!!!