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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. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Cabling specifications for 10 Gigabit Ethernet
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Creating the VLAN

2. What is FIB?
The CEF entry version number
Routing table and ARP table
IEEE 802.3z
Forwarding Information Base

3. What is 1000BASE-X?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
IEEE 802.3u
Cabling specifications for Gigabit Ethernet
Route caching and topology based

4. What is 100BASE-FX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
ANSI X3T11 FibreChannel
On
Feature Manager (FM) and Switching Database Manager (SDM)

5. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
Switch#show interfaces status
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
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
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

6. What are the duplex modes of a GigaStack GBIC?
Switch(config-if)#switchport mode access
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch#show interfaces status
Only temporarily for debugging purposes

7. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
Manually by administratively disabling and re-enabling the port
300 seconds
10GbE operates only at full duplex
Switch(config-if)#no switchport

8. What is the default duplex mode of a 10 Mbps Ethernet interface?
Logical Operation Unit
Trunk or dynamic
IEEE 802.3ab
Half duplex

9. Configures the maximum ageing time for entries in the MAC address table
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#errdisable detect cause security-violation
Switch(config)#mac address-table aging-time {seconds}
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

10. Sets the administrative mode of a switch port to access
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
The Null adjacency
Switch(config-if)#switchport mode access
IEEE 802.3

11. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Off
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
SVI

12. What connectors can be used with SFP modules?
The adjacency table
LAN PHY and WAN PHY
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
LC - MT-RJ or RJ-45

13. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
They are dropped (ARP throttling)
LOU registers
The Discard adjacency
The switch port falls back to default setting of half duplex

14. What are the Gigabit Ethernet autonegotiation selection priorities?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Tunnel
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch#show interfaces {interface}

15. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#errdisable detect cause udld
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Tunnel

16. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
Store-and-forward
Creating the VLAN
A name assigned to a ranges of interfaces

17. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Cabling specifications for 10 Gigabit Ethernet
Accelerated CEF (aCEF)
Trunk or dynamic
IEEE 802.3u

18. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
On
Content-Addressable Memory
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch(config-if)#duplex {auto | full | half}

19. What are the operational modes of a Layer 2 switched interface?
FIB with adjacency table
Switch#show cef drop
Down - static access - trunk or tunnel
Off

20. What is 10GBASE-LX4/LW4?
The table of learned MAC addresses - ports - and VLAN information
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
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)

21. Displays the entire Forwarding Information Base (FIB)
Security and QoS ACLs
Switch#show ip cef
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
SC or MT-RJ

22. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
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
The Drop adjacency
Switch(config-if)#no switchport
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

23. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch(config)#errdisable detect cause l2ptguard
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
The adjacency table

24. What is 10GBASE-SR/SW?
The Null adjacency
In parallel revealing the best (longest) match in a single table lookup
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config-if)#no ip route-cache cef

25. How do Layer 2 switches provide isolation between hosts?
Switch(config)#default interface {interface}
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#errdisable recovery cause {all | {cause-name}}

26. What is the prerequesite for creating a working SVI?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config-if)#no ip route-cache cef
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Creating the VLAN

27. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config)#errdisable detect cause vmps
Institute of Electrical and Electronics Engineers
They are dropped (ARP throttling)
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

28. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch#show cef drop
Dynamic
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

29. Displays the contents of the CAM table
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Layer 3 forwarding engine
A name assigned to a ranges of interfaces
Switch(config-if)#no ip route-cache cef

30. Enables error-disable for conditions that trigger port security configured on a port
UTP Fast Ethernet and Gigabit Ethernet
Half duplex
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause psecure-violation

31. What is a GigaStack GBIC?
Switch#show running-config interface {interface}
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
IEEE 802.3ae

32. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Store-and-forward
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Compiling Access Control Entries (ACE) into the TCAM table

33. What is 10BASE-T?
Static access or trunk
By Mask/Value - where each unique mask has eight value patterns associated with it
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

34. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
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)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
The CEF epoch number
Switch(config)#errdisable detect cause udld

35. What information is recorded in CAM as frames arrive on a switch port?
Switch(config-if)#no ip route-cache cef
Switch#show ip cef
Source MAC address; Port of arrival; VLAN; Time stamp
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

36. Enables error-disable when a storm control threshold has been exceeded on a port
Down - static access - trunk or tunnel
In TCAM Value entries
When one station transmits at the same time as another on a shared medium
Switch(config)#errdisable detect cause storm-control

37. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
In TCAM Value entries
Switch(config)#errdisable detect cause channel-misconfig
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

38. Adds a static entry to the MAC address table
IEEE 802.3
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
CEF glean
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

39. What is the TCAM Value and Mask for an IGMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Interconnecting switches in a campus network
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

40. What is the original standard for Ethernet (10 Mbps)?
Trunk
IEEE 802.3
Switch(config)#errdisable recovery cause {all | {cause-name}}
Electromagnetic Interference

41. Enables error-disable for misconfiguration of EtherChannel bundles
Switch(config)#errdisable detect cause vmps
Switch(config)#errdisable detect cause channel-misconfig
The Punt adjacency
Switch(config)#errdisable detect cause unicast-flood

42. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch#show ip cef {interface} [detail]
Switch#show interfaces status err-disabled
40 km
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

43. Displays error-disabled detection status
Switch#show errdisable detect
IEEE 802.3ab
American National Standards Institute
Slow response times - low throughput - runts and other input errors on the switch ports

44. What connectors can be used with GBIC modules?
Feature Manager (FM) and Switching Database Manager (SDM)
SC fibre optic or RJ-45 UTP
When one station transmits at the same time as another on a shared medium
Switch(config)#interface range macro {name}

45. What is half duplex operation?

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46. Disables CEF operation on an interface
The CEF epoch number
Switch(config-if)#no ip route-cache cef
Native routed interface
Switch(config)#errdisable detect cause {all | {cause-name}}

47. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
100 metres
The CEF epoch number
When one station transmits at the same time as another on a shared medium
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

48. Selects an interface-range macro and enters interface configuration mode
Electromagnetic Interference
Switch(config)#interface range macro {name}
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
SVI

49. What is CSMA/CD?
Wide-Wavelength Division Multiplexing
Carrier Sense Multiple Access Collision Detection
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#errdisable detect cause channel-misconfig

50. Enables error-disable for conditions that trigger unicast flood blocking on a port
Switch(config)#errdisable detect cause unicast-flood
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch#show adjacency [{interface}] [summary | detail]
25 metres