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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config-if)#switchport mode access
Accelerated CEF (aCEF)
Switch(config-if)#no switchport
1 -2 on one end with 3 -6 on the other end

2. Displays CEF adjacency table information
The switch port falls back to default setting of half duplex
FIB with adjacency table
Switch#show adjacency [{interface}] [summary | detail]
Packets that have been truncated before they were fully received

3. Resets the configuration of a switch port to its default values
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Cisco Express Forwarding
Switch(config)#default interface {interface}

4. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
American National Standards Institute
Switch(config)#errdisable detect cause udld
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

5. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
The adjacency table
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

6. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Trunk or dynamic
Switch(config-if)#switchport mode access
Switch(config)#errdisable detect cause {all | {cause-name}}
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

7. Disables a switch port
Distributed CEF (dCEF)
Switch(config-if)#shutdown
S = Short; L = Long; E = Extra-long
SVI

8. Enables error-disable when a link is seen to be unidirectional
Switch(config)#errdisable detect cause udld
Switch(config)#interface range macro {name}
The CEF entry version number
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

9. What is a ternary combination?

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10. What are GigaStack GBICs used for?
Trunk or dynamic
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

11. What is an interface-range macro?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Null adjacency
A name assigned to a ranges of interfaces
Distributed CEF (dCEF)

12. What information is stored in CAM?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
The table of learned MAC addresses - ports - and VLAN information
SVI or native routed interface

13. What is the administrative mode of a switch port that is a member of one VLAN?
Switch#show cef not-cef-switched
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Static access or dynamic

14. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Electromagnetic Interference
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#errdisable detect cause vmps
Switch(config-if)#switchport mode access

15. Configures a switch port with a static access VLAN assignment
10 km
Switch(config)#errdisable detect cause vmps
Configure the appropriate values manually on both ends of the link
Switch(config-if)#switchport access vlan {vlan}

16. What is half duplex operation?

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17. Displays a list of all interfaces in an error-disabled state
15 metres
Switch#show interfaces status err-disabled
Switch(config)#interface vlan {vlan-id}
LAN PHY and WAN PHY

18. What are the reasons for packets being dropped by CEF?
Cisco Express Forwarding
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
400 metres half duplex and 2000 metres full duplex
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

19. What is the name of the CEF engine that maintains routing information in software?
The Layer 3 engine
Full duplex
IEEE 802.3
Cabling specifications for 10 Gigabit Ethernet

20. What is the TCAM Value and Mask for an IP access list?
Switch(config)#errdisable detect cause l2ptguard
Switch#show ip cef
Cabling specifications for 10 Gigabit Ethernet
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

21. Displays the entire Forwarding Information Base (FIB)
On
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch#show ip cef
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

22. What is the maximum cabling distance for 10GBASE-CX4?
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
On
LOU registers
15 metres

23. What is the default duplex mode of a Gigabit Ethernet interface?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable recovery interval {seconds}
Full duplex

24. When can a switch start to learn source MAC addresses on incoming ports?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause dhcp-rate-limit
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Full duplex only

25. How are MAC addresses shown in the detailed output from the CEF adjacency table?
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
CEF punt
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

26. Sets the administrative mode of a switch port to access
Switch#show errdisable detect
Switch(config-if)#switchport mode access
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
1000BASE-T full duplex followed by 1000BASE-T half duplex

27. Displays CEF Punt statistics with number of packets and reason for each line card
Switch#show cef not-cef-switched
The CEF epoch number
A three-fold combination of 0 - 1 and X (don't care)
With a mask value in addition to binary values to decide which keys in a table are relevant

28. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Off
From 30 seconds to 86 -400 seconds (24 hours)
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated

29. What are the duplex modes of a GigaStack GBIC?
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
The CEF entry version number
Switch(config)#errdisable recovery interval {seconds}

30. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
Switch#show adjacency [{interface}] [summary | detail]
IEEE 802.3u
The Null adjacency

31. Adds a static entry to the MAC address table
IEEE 802.3z
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Static access or trunk
Switch(config)#errdisable detect cause dhcp-rate-limit

32. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Cabling specifications for 10 Gigabit Ethernet
The CEF epoch number
The Drop adjacency

33. What connectors can be used with GBIC modules?
Switch(config)#errdisable detect cause security-violation
Static access or dynamic
SC fibre optic or RJ-45 UTP
Half duplex

34. What connectors can be used with SFP modules?
LC - MT-RJ or RJ-45
SC or MT-RJ
Switch(config)#interface range macro {name}
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

35. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Switch#show adjacency [{interface}] [summary | detail]
LAN PHY and WAN PHY
Content-Addressable Memory
UTP Fast Ethernet and Gigabit Ethernet

36. What is the standard for 1000BASE-T?
IEEE 802.3ab
They are dropped (ARP throttling)
Switch(config)#errdisable detect cause l2ptguard
Process the first packet in a traffic flow to determine the destination

37. What is the DTP negotiation mode of a switch port configured as dynamic?
Switch(config)#errdisable recovery interval {seconds}
Static access or dynamic
On
IEEE 802.3ab

38. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Ternary Content-Addressable Memory
Switch#show cef drop

39. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
Switch(config-if)#shutdown
American National Standards Institute
LOU registers
Slow response times - low throughput - runts and other input errors on the switch ports

40. What is LOU?
The Discard adjacency
LAN PHY and WAN PHY
Logical Operation Unit
Store-and-forward

41. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
Store-and-forward
The Punt adjacency
CEF glean
The CEF entry version number

42. What is the standard for Gigabit Ethernet (1000 Mbps)?
Switch(config)#default interface {interface}
IEEE 802.3z
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

43. What is CSMA/CD?
A name assigned to a ranges of interfaces
Carrier Sense Multiple Access Collision Detection
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

44. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Static access or trunk
The Discard adjacency
Store-and-forward
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache

45. What is the prerequesite for creating a working SVI?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config)#errdisable detect cause rootguard
Creating the VLAN
The Null adjacency

46. What is CAM?
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause l2ptguard
On
Content-Addressable Memory

47. What is the maximum cabling distance for 10GBASE-LR/LW?
On
10 km
CEF punt
IEEE 802.3u

48. What is 1000BASE-X?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Cabling specifications for Gigabit Ethernet
In TCAM Value entries
Switch(config)#errdisable detect cause link-flap

49. How are the TCAM Mask/Value pairs evaluated?
300 seconds
In parallel revealing the best (longest) match in a single table lookup
On
Switch(config)#errdisable detect cause psecure-violation

50. Disables CEF operation globally
ANSI X3T11 FibreChannel
Switch(config)#errdisable detect cause bpduguard
Switch(config)#no ip cef
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP