Test your basic knowledge |

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 DTP negotiation mode of a switch port configured as trunk?
Packets that have been truncated before they were fully received
LC - MT-RJ or RJ-45
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
On

2. Displays CEF Drop statistics with number of packets and reason for each line card
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
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 cef drop

3. What is the maximum cabling distance for 1000BASE-SX?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switch(config)#errdisable detect cause channel-misconfig

4. Enables error-disable for when the port link state is flapping between the up and down states
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause link-flap
A name assigned to a ranges of interfaces
SC fibre optic or RJ-45 UTP

5. Disables a switch port
Switch(config)#errdisable detect cause loopback
Switch(config-if)#switchport mode access
Switch(config-if)#shutdown
LOU registers

6. What is 10GBASE-ER/EW?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
ANSI X3T11 FibreChannel
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10GbE operates only at full duplex

7. What is 10BASE-T?
Switch(config)#interface {type}{module}/{number}
Switch(config)#errdisable detect cause unicast-flood
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Tunnel

8. What happens to subsequent packets destined for FIB entries in CEF glean state?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Static access
Switch#show cef not-cef-switched
They are dropped (ARP throttling)

9. Enables error-disable for errors with Layer 2 Protocol Tunnelling
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch(config)#errdisable detect cause l2ptguard
Content-Addressable Memory
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

10. What is the name of the CEF engine that maintains routing information in software?
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
The Layer 3 engine
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch#show cef not-cef-switched

11. What is WAN PHY used for?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Store-and-forward
1 -2 on one end with 3 -6 on the other end
A name assigned to a ranges of interfaces

12. Adds a static entry to the MAC address table
Switch#show cef not-cef-switched
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

13. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause l2ptguard
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

14. What connectors can be used with GBIC modules?
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
40 km
SC fibre optic or RJ-45 UTP
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

15. Enables error-disable for conditions that trigger port security configured on a port
S = Short; L = Long; E = Extra-long
Switch(config-if)#switchport mode access
Switch(config)#errdisable detect cause psecure-violation
15 metres

16. What is Fast EtherChannel (FEC)?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
10GbE operates only at full duplex
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Full duplex

17. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Static access or trunk
SC or MT-RJ
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

18. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config)#errdisable detect cause gbic-invalid
Tunnel
Full duplex

19. How is link speed determined on Fast Ethernet links configured to autonegotiate?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#interface {type}{module}/{number}
Switch#show ip cef {interface} [detail]
Enable error-disable for all possible causes

20. What function is performed by the Switching Database Manager (SDM)?
Switch#show ip cef
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#errdisable detect cause dhcp-rate-limit
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

21. What is the original standard for Ethernet (10 Mbps)?
Switch(config)#errdisable detect cause udld
IEEE 802.3
Process the first packet in a traffic flow to determine the destination
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

22. What is the operational mode of a switch port that is a member of one VLAN?
Static access
Switch(config)#errdisable detect cause loopback
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
100 metres

23. What is the operational mode of a switch port that carries traffic for multiple VLANs?
The CEF epoch number
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Trunk

24. What are GigaStack GBICs used for?
Switch(config-if)#duplex {auto | full | half}
American National Standards Institute
Native routed interface
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

25. Enables error-disable for misconfiguration of EtherChannel bundles
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
By Mask/Value - where each unique mask has eight value patterns associated with it
Ternary Content-Addressable Memory
Switch(config)#errdisable detect cause channel-misconfig

26. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
100 metres
Half duplex
15 metres
Creating the VLAN

27. What is the role of a Route Processor (RP) in first generation MLS?
Process the first packet in a traffic flow to determine the destination
Switch#show ip cef
Switch#show errdisable detect
Switch(config)#errdisable detect cause storm-control

28. What are the operational modes of a Layer 2 switched interface?
Down - static access - trunk or tunnel
Switch(config)#default interface {interface}
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
300 seconds

29. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Feature Manager (FM) and Switching Database Manager (SDM)
SC or MT-RJ
Security and QoS ACLs
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding

30. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
1 -2 on one end with 3 -6 on the other end
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

31. What is a SVI?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
A station must wait its turn to transmit; it can't transmit and receive at the same time
Switched virtual interface (SVI)
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

32. What is the TCAM Value and Mask for an ICMP access list?
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Switch(config)#errdisable detect cause psecure-violation
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
LAN PHY and WAN PHY

33. What is the TCAM Value and Mask for an IPX access list?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Configure the appropriate values manually on both ends of the link
A name assigned to a ranges of interfaces
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

34. What is 100BASE-T4?
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
R = LAN PHY; W = WAN PHY
Down - static access - trunk or tunnel
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

35. What combinations are TCAM entries composed of?
Value - Mask - and Result (VMR)
Switch(config)#interface vlan {vlan-id}
S = Short; L = Long; E = Extra-long
Forwarding Information Base

36. What is the maximum cabling distance for 10GBASE-ER/EW?
15 metres
40 km
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

37. What is 100BASE-FX?
Distributed CEF (dCEF)
Interconnecting switches in a campus network
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

38. What is CAM?
Switch#show ip cef {interface} [detail]
The Discard adjacency
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Content-Addressable Memory

39. What is MLS?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
The Layer 3 forwarding engine
Down - static access - trunk or tunnel
Multilayer Switching

40. What is 10GBASE-LX4/LW4?
R = LAN PHY; W = WAN PHY
The Layer 3 engine
Native routed interface
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

41. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
SC fibre optic or RJ-45 UTP
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
Switch#show running-config interface {interface}
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

42. What is half duplex operation?

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43. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
SVI or native routed interface
10 km
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

44. What CEF optimisation replicates the entire FIB table among switch line cards?
Content-Addressable Memory
UTP Fast Ethernet and Gigabit Ethernet
IEEE 802.3
Distributed CEF (dCEF)

45. What is the maximum cabling distance for 10GBASE-CX4?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch#show ip cef {interface} [detail]
15 metres
300 seconds

46. What information is stored in TCAM?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Security and QoS ACLs
Route caching and topology based
Switch(config-if)#switchport access vlan {vlan}

47. What CEF adjacency is used to switch packets that can't be forwarded normally?
The Drop adjacency
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
A name assigned to a ranges of interfaces

48. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
The Punt adjacency
Switch(config)#errdisable detect cause ilpower
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Ternary Content-Addressable Memory

49. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config)#errdisable detect cause vmps
Distributed CEF (dCEF)
Collision domain
The adjacency table

50. What are the types of layer 3 switched interfaces
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
LC - MT-RJ or RJ-45
Store-and-forward
SVI or native routed interface