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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. Enables error-disable for the presence of invalid GBIC or SFP modules
Off
Switch(config)#errdisable detect cause gbic-invalid
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

2. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
400 metres half duplex and 2000 metres full duplex
70 km for 9 micron SMF; 100 km for 8 micron SMF
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

3. Adds a static entry to the MAC address table
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

4. What is the standard for 1000BASE-T?
On
Switch(config)#errdisable detect cause dtp-flap
IEEE 802.3ab
LAN PHY and WAN PHY

5. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
XENPAK - X2 - or SFP+
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch#show errdisable detect

6. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
In TCAM Value entries
Configure the appropriate values manually on both ends of the link
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

7. What is 10GBASE-SR/SW?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
SVI
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Value - Mask - and Result (VMR)

8. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#errdisable detect cause pagp-flap
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Cabling specifications for 10 Gigabit Ethernet

9. What is the default duplex mode of a 10 Mbps Ethernet interface?
Switch(config)#errdisable detect cause bpduguard
Half duplex
Institute of Electrical and Electronics Engineers
300 seconds

10. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
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
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show interfaces {interface} switchport

11. Displays CEF Drop statistics with number of packets and reason for each line card
Configure the appropriate values manually on both ends of the link
Switch(config)#errdisable detect cause channel-misconfig
Switch#show cef drop
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

12. What is the role of a Route Processor (RP) in first generation MLS?
Only temporarily for debugging purposes
Full duplex
Process the first packet in a traffic flow to determine the destination
CEF glean

13. Selects multiple switch port interfaces at the same time and enters interface configuration mode
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
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
10 km

14. What are the common cabling specifications for Gigabit Ethernet?
In TCAM Value entries
Switch#show errdisable recovery
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

15. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
SVI
Switch(config)#errdisable detect cause security-violation
Dynamic
Switch#show errdisable detect

16. What are the Fast Ethernet autonegotiation selection priorities?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
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
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
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

17. What are runts?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Trunk
Packets that have been truncated before they were fully received
IEEE 802.3ab

18. What is the maximum cabling distance for 10GBASE-CX4?
A name assigned to a ranges of interfaces
15 metres
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Switch(config)#errdisable detect cause unicast-flood

19. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
70 km for 9 micron SMF; 100 km for 8 micron SMF
15 metres
Switch(config)#errdisable detect cause security-violation

20. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Switch#show errdisable detect
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config)#errdisable detect cause psecure-violation
Trunk

21. What is the DTP negotiation mode of a switch port configured as static access?
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#errdisable detect cause l2ptguard
Off
Switch(config)#errdisable detect cause link-flap

22. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Dynamic
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause storm-control
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

23. What Ethernet ports allow for autonegotiation?
Static access
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
300 seconds
UTP Fast Ethernet and Gigabit Ethernet

24. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch(config-if)#duplex {auto | full | half}
Switch(config)#default interface {interface}
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
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

25. What information is stored in TCAM?
300 seconds
Switch#show adjacency [{interface}] [summary | detail]
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Security and QoS ACLs

26. How are MAC addresses shown in the detailed output from the CEF adjacency table?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Trunk or dynamic
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

27. What is EMI?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch#show interfaces status err-disabled
Electromagnetic Interference
The Punt adjacency

28. Displays CEF adjacency table information
Switch(config-if)#description {string}
Switch(config)#interface vlan {vlan-id}
Switch#show adjacency [{interface}] [summary | detail]
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

29. What is the TCAM Value and Mask for an Ethernet access list?
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#errdisable detect cause unicast-flood
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

30. What are the duplex modes of a GigaStack GBIC?
300 seconds
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

31. What is LOU?
LAN PHY and WAN PHY
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Logical Operation Unit

32. Removes entries from the CAM table
Switch(config)#errdisable detect cause psecure-violation
Numeric values that represent what action to take after the TCAM lookup occurs
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}]

33. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause l2ptguard
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

34. What is MLS?
Logical Operation Unit
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Multilayer Switching
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

35. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
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
Switch(config)#no ip cef
1 -2 on one end with 3 -6 on the other end
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

36. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
10 km
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

37. What is 10GBASE-ER/EW?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch#show interfaces {interface} switchport

38. What is 1000BASE-X?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
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
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable detect cause arp-inspection

39. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch(config-if)#description {string}
Route caching and topology based
IEEE 802.3z

40. Displays interface configuration information
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause dhcp-rate-limit
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
Switch#show running-config interface {interface}

41. What CEF adjacency is used to switch packets that can't be forwarded normally?
In TCAM Value entries
The Drop adjacency
From 30 seconds to 86 -400 seconds (24 hours)
The table of learned MAC addresses - ports - and VLAN information

42. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable detect cause vmps
Switch(config-if)#speed {10 | 100 | 1000 | auto}
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

43. What is the content of TCAM Mask entries?

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44. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
Numeric values that represent what action to take after the TCAM lookup occurs
10GbE operates only at full duplex
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Route caching and topology based

45. What is half duplex operation?

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46. What is LAN PHY used for?
IEEE 802.3ab
Tunnel
10GbE operates only at full duplex
Interconnecting switches in a campus network

47. Configures the maximum ageing time for entries in the MAC address table
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#mac address-table aging-time {seconds}
Trunk
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

48. What is TCAM overflow?
Collision domain
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

49. What function is performed by the Switching Database Manager (SDM)?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
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
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Only temporarily for debugging purposes

50. Enables error-disable for errors with dynamic ARP inspection
IEEE 802.3u
Only temporarily for debugging purposes
Switch(config)#errdisable detect cause arp-inspection
The Layer 3 engine