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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 denotes the number of times the CEF table has been flushed and regenerated as a whole?
The CEF epoch number
Switch(config)#errdisable detect cause dtp-flap
Source MAC address; Port of arrival; VLAN; Time stamp
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

2. Displays CEF Punt statistics with number of packets and reason for each line card
Switch(config-if)#shutdown
Switch#show cef not-cef-switched
Switch(config-if)#switchport access vlan {vlan}
70 km for 9 micron SMF; 100 km for 8 micron SMF

3. What are the reasons for packets being dropped by CEF?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
R = LAN PHY; W = WAN PHY
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

4. What are runts?
Compiling Access Control Entries (ACE) into the TCAM table
Packets that have been truncated before they were fully received
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#errdisable detect cause dtp-flap

5. What connectors can be used with SFP modules?
LC - MT-RJ or RJ-45
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch#show interfaces status
IEEE 802.3

6. Creates an interface-range macro
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable detect cause {all | {cause-name}}
Multilayer Switching

7. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause loopback
Switch(config)#errdisable detect cause unicast-flood
Tunnel
Switch(config)#errdisable detect cause rootguard

8. What are GigaStack GBICs used for?
Switch#show ip cef {interface} [detail]
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
LC - MT-RJ or RJ-45
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

9. What is LOU?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Routing table and ARP table
Logical Operation Unit
Only temporarily for debugging purposes

10. What is 100BASE-FX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
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
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

11. What is the name of the CEF engine that forwards packets in hardware?
Switch(config)#interface vlan {vlan-id}
The Layer 3 forwarding engine
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
The Null adjacency

12. Disables CEF operation on an interface
Accelerated CEF (aCEF)
Switch(config-if)#no ip route-cache cef
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)
From 30 seconds to 86 -400 seconds (24 hours)

13. Enables error-disable for conditions that trigger port security configured on a port
Switch(config)#errdisable detect cause psecure-violation
Half duplex
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

14. Displays the entire Forwarding Information Base (FIB)
Switch(config)#default interface {interface}
Switch#show ip cef
Switch(config-if)#shutdown
Switch(config)#errdisable detect cause l2ptguard

15. What are the administrative modes of Layer 2 switched interfaces?
Static access - trunk - tunnel or dynamic
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
Off
On

16. What is 1000BASE-T?
R = LAN PHY; W = WAN PHY
The Layer 3 engine
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Static access or dynamic

17. What is 1000BASE-LX/LH?
15 metres
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

18. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch#show ip cef {interface} [detail]
Static access or dynamic
Switch(config)#errdisable detect cause link-flap
The switch port falls back to default setting of half duplex

19. What is the content of TCAM Result entries?
Cabling specifications for Gigabit Ethernet
Numeric values that represent what action to take after the TCAM lookup occurs
Switch(config)#errdisable detect cause dtp-flap
Static access - trunk - tunnel or dynamic

20. What is the name of the CEF engine that maintains routing information in software?
Switch(config)#interface {type}{module}/{number}
The Layer 3 engine
Half duplex
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

21. What is 10GBASE-CX4?
Static access or trunk
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Compiling Access Control Entries (ACE) into the TCAM table
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

22. 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)
Switch#show errdisable recovery
In parallel revealing the best (longest) match in a single table lookup
Switch#show ip cef

23. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show adjacency [{interface}] [summary | detail]
Store-and-forward
IEEE 802.3u

24. What is full duplex operation?
Route caching and topology based
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#no ip cef

25. Resets the configuration of a switch port to its default values
Switch(config)#default interface {interface}
The Punt adjacency
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
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

26. Enables error-disable for the presence of invalid GBIC or SFP modules
Ternary Content-Addressable Memory
Switch(config)#errdisable detect cause gbic-invalid
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
ANSI X3T11 FibreChannel

27. What is a ternary combination?

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28. What function is performed by the Switching Database Manager (SDM)?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause security-violation
Switch(config)#errdisable detect cause arp-inspection

29. What is error-disable state?
Switch(config)#errdisable detect cause bpduguard
A switch port that has been shut down automatically due to a serious error condition
Switch(config-if)#shutdown
LOU registers

30. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
By Mask/Value - where each unique mask has eight value patterns associated with it
Content-Addressable Memory
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

31. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
IEEE 802.3u
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
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Interconnecting switches in a campus network

32. What is the role of a Route Processor (RP) in first generation MLS?
In TCAM Value entries
Process the first packet in a traffic flow to determine the destination
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
The Punt adjacency

33. What information is stored in TCAM?
Packets that have been truncated before they were fully received
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config)#errdisable detect cause {all | {cause-name}}
Security and QoS ACLs

34. What is the default duplex mode of a 10 Mbps Ethernet interface?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Half duplex
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#mac address-table aging-time {seconds}

35. What are the common cabling specifications for Gigabit Ethernet?
300 seconds
Process the first packet in a traffic flow to determine the destination
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

36. What is the maximum cabling distance for 10GBASE-SR/SW?
Switch(config)#errdisable detect cause l2ptguard
LAN PHY and WAN PHY
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switched virtual interface (SVI)

37. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause vmps
R = LAN PHY; W = WAN PHY
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

38. What is the operational mode of a switch port that is a member of one VLAN?
Static access
Switch(config-if)#no switchport
S = Short; L = Long; E = Extra-long
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

39. What is the administrative mode of a switch port that is a member of one VLAN?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config-if)#description {string}
70 km for 9 micron SMF; 100 km for 8 micron SMF
Static access or dynamic

40. What are the types of layer 3 switched interfaces
Cisco Express Forwarding
A switch port that has been shut down automatically due to a serious error condition
SVI or native routed interface
Switch(config)#errdisable detect cause dhcp-rate-limit

41. What happens to subsequent packets destined for FIB entries in CEF glean state?
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
Trunk or dynamic
They are dropped (ARP throttling)
Switch(config)#errdisable detect cause l2ptguard

42. What is the maximum cabling distance for 10GBASE-CX4?
Compiling Access Control Entries (ACE) into the TCAM table
100 metres
Wide-Wavelength Division Multiplexing
15 metres

43. What is the default duplex mode of a Gigabit Ethernet interface?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Full duplex
Multilayer Switching

44. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
The switch port falls back to default setting of half duplex
Enable error-disable for all possible causes
Logical Operation Unit
Configure the appropriate values manually on both ends of the link

45. Adds a static entry to the MAC address table
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch#show interfaces {interface} switchport
SVI or native routed interface
Institute of Electrical and Electronics Engineers

46. What is the maximum cabling distance for 10GBASE-LX4/LW4?
With a mask value in addition to binary values to decide which keys in a table are relevant
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
The CEF entry version number
A name assigned to a ranges of interfaces

47. How do Layer 2 switches provide isolation between hosts?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Store-and-forward
Electromagnetic Interference
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

48. What is the default duplex mode of a Fast Ethernet interface?
400 metres half duplex and 2000 metres full duplex
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable detect cause l2ptguard
Half duplex

49. What function is performed by the Feature Manager (FM)?
Half duplex
Compiling Access Control Entries (ACE) into the TCAM table
Switch(config)#errdisable detect cause dtp-flap
Dynamic

50. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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