Answer:: Explanation | Network Switch | Port (Computer Networking)

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  VTP实验题 Question: This task requires you to use the CLI of Sw-AC3 to answer five multiple-choice questions. This does not require any configuration. To answer the multiple-choice questions, click on the numbered boxes in the right panel. There are five multiple-choice questions with this task. Be sure to answer all five questions before leaving this item. Question 1: What interface did Sw-AC3 associate with source MAC address 0010.5a0c.ffba ? a)Fa0/1 b) Fa0/3 c) Fa0/6 d) Fa0/8 e) Fa0/9 f) Fa0/12
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    Q ue s t i on:   VTP实验题 T h i s   task  r e qu i r e s you to use the CLI of  Sw-AC3 to answer f  i v e   m u l t i p l e - c ho i c e   qu e s t i on s .   T h i s   does not r e qu i r e   a n y   c on f  i gu r a t i on.  To answer the m u l t i p l e - c ho i c e   qu e s t i on s ,   c li c k  on the numbered boxes i n the r i gh t p a n e l .  There are f  i v e   m u l t i p l e - c ho i c e   qu e s t i on s   w i t h t h i s   task. Be sure to answer a ll   f  i v e   qu e s t i on s   b e f  o r e l ea v i ng t h i s   i t e m .   Question 1 :  What i n t e r f  a c e   d i d Sw-AC3 a ss o c i a t e   w i t h   source MAC address 0010.5 a 0 c . ff  b a   ?  a)Fa0/1b) Fa0/3 c ) Fa0/6d) Fa0/8 e ) Fa0/9 f  )   Fa 0  /  12   Answer: Fa 0  /  8   Explanation: to find out w h i c h   i n t e r f  a c e   a ss o c i a t e d   w i t h a g i v e n MAC address, use the show mac- a ddr e ss - t a bl e   command. It shows the l ea r n e d MAC addresses and t h e i r   a ss o c i a t e d   i n t e r f  a c e s .   A f  t e r e n t e r i ng t h i s   command, you will s ee a MAC address t a b l e   li k  e t h i s :     From t h i s t a b l e we can f  i gu r e out that the MAC address 0010.5 a 0 c . ff  b a   i s   a ss o c i a t e d   w i t h   i n t e r f  a c e   Fa 0  /  8   Question 2 :  What ports on Sw-AC3 are op e r a t i ng   has trunks (choose th r ee ) ?  a)Fa0/1b) Fa0/3 c ) Fa0/4d)Fa0/6 e ) Fa0/9 f  )   Fa 0  /  12   Answer: Fa0/3, Fa0/9 and F a 0  /  12   Explanation:Use the show interface trunk  command to d e t e r m i n e the t r un k  i ng   status of  a li n k  and VLAN status. Th i s   command li s t s port, i t s mode, e n c a p s u l a t i on and whether it i s t r un k  i ng. The i m a g e b e l o w   shows how it w o rk  s :  Question 3 :  What k  i nd   of  router i s   VLA N- R 1 ?  a) 1720b ) 1841 c ) 2611d) 2620   Answer: 2620   Explanation: VLAN-R1 i s the router d i r e c t l y   connected to Sw-Ac3 s w i t c h,   so we can use the show cdpneighbors c o mm a nd to s ee : 1. N e i ghbo r   D e v i c e   ID : The name of  the n e i ghbo r   d e v i c e ; 2. L o c a l   I n t e r f  a c e : The i n t e r f  a c e to w h i c h t h i s   n e i ghbo r   i s   h ea r d  3. C a p a b ili t y : C a p a b ili t y   of t h i s   n e i ghbo r i ng   d e v i c e - R for router, S for s w i t c h, H for Host e t c .  4. Platform: Which type of device the neighbor i s  5. Port ID: The i n t e r f  a c e   of  the remote n e i ghbo r you r e c e i v e CDP i n f  o r m a t i on  6. H o l d t i m e : D e c r e m e n t a l   ho l d t i m e   i n   s e c ond s   S a m p l e output of  show cdp n e i ghbo r s   c o mm a nd : One t h i ng   I want to no t i c e you i s   L o c a l   I n t r f  c e   i n the i m a g e above r e f  e r s to the l o c a l   i n t e r f  a c e on the d e v i c e you a r e   r unn i ng the show cdp n e i ghbo r s   c o mm a nd   Question 4: W h i c h   s w i t c h   i s the root b r i dg e   for VLAN 1 ?      Answer: S w-D S 1   Explanation:First we use the show spanning-tree vlan 1to v i e w the s p a nn i ng - t r ee   i n f  o r m a t i on   o f    VLAN 1  From the C o s t 19 , we l ea r n that the root s w i t c h   i s   d i r e c t l y   connected to the Sw-Ac3 s w i t c h over a   100Mbps Ethernet li n k    N o t i c e that if  you see a ll   of  the i n t e r f  a c e   r o l e s are Desg ( d e s i gn a t e d ) then you can c on f  i r m   S w -A c 3   s w i t c h   i s the root b r i dg e   for t h i s   VLAN (VLAN 1 ) .   If  you see there i s at l ea s t one Root port i n the i n t e r f  a c e   r o l e s then you can c on f  i r m Sw-Ac3 i s not the root b r i dg e   because r oo t b r i dg e   does not have root port. In t h i s   case, we no t i c e that the root port on Sw- Ac3 s w i t c h   i s   FastEthernet0/12, so we have t o   f  i gu r e out w h i c h   s w i t c h   i s   a ss o c i a t e d   w i t h t h i s port -> it i s theroot b r i dg e . You can v e r i f  y   it w i t h the show cdp ne i ghbor s   c o mm a nd : The L o c a l   I n t r f  c e   c o l u m n   r e f  e r s to the i n t e r f  a c e on the s w i t c h   r unn i ng   show cdp n e i ghbo r s   command. In t h i s   case, S w-D S 1   i s   a ss o c i a t e d   w i t h   i n t e r f  a c e   FastEthernet0/12 -> Sw-DS1 i s the root b r i dg e Question 5: What address s hou l d be c on f  i gu r e d   a s the d e f  a u l t - g a t e w a y   for the host connected to i n t e r f  a c e   f  a 0/4 of  S W- A c 3 ?   Answer: 192.168.44.254   Ex pl a na t i on:   First we have to i d e n t i f  y   w h i c h   VLAN i n t e r f  a c e Fa0/4 b e l ong s to by the show vlan c o mm a nd  From the e x h i b i t we know that VLAN 44 i s   c on f  i gu r e d on router u s i ng   s ub - i n t e r f  a c e Fa0/0.44 w i t h   I P   address 192.168.44.254  /  24      T h e r e f  o r e the d e f  a u l t gateway of  the host s hou l d be 192.168.44.254   Question 6:From w h i c h   s w i t c h   d i d Sw-Ac3 r e c e i v e   VLAN i n f  o r m a t i on   ?   Answer: S w- A C 2   Explanation: to v i e w the VTP c on f  i gu r a t i on   i n f  o r m a t i on,   use the show vtp status c o mm a nd  So we knew Sw-Ac3 r e c e i v e d   VLAN i n f  o r m a t i on   f  r o m 163.5.8.3 ( no t i c e :t h e   I P   address may be d i ff  e r e n t ) . Fi n a ll y we use t h e   show cdp neighbors detailto find out who 163.5.8.3 i s :  Question 7: R e f  e r to the e x i b i t , SwX was taken out of  the p r odu c t i on network  for m a i n t e n a n c e .   It will be reconnected to t h e   Fa 0/16 port of  Sw-Ac3. What happens to the network when it i s   reconnected and atrunk  e x i s t s   between the two s w i t c h e s ?  
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